skin radiation dose limit
Retain a copy of or electronically store the Uniform Low-Level Radioactive Waste Manifest and documentation of acknowledgement of receipt as the record of transfer of licensed material as required by 10 CFR parts 30, 40, and 70 of this chapter; 7. The assigned deep-dose equivalent must be for the part of the body receiving the highest exposure. (c) For holders of an operating license or a combined license for a nuclear power plant, the occurrences included in paragraph (a) of this section must be reported in accordance with the procedures described in 50.73(b), (c), (d), (e), and (g) of this chapter, and must include the information required by paragraph (b) of this section. 56 FR 23398, May 21, 1991, unless otherwise noted. The NCRP (1989 . The approximate volume of waste within a container; 9. Get more out of your subscription* Access to over 100 million course-specific study resources; 24/7 help from Expert Tutors on 140+ subjects; Full access to over 1 million Textbook Solutions (d) Each person involved in the transfer for disposal and disposal of waste, including the waste generator, waste collector, waste processor, and disposal facility operator, shall comply with the requirements specified in section III of appendix G to 10 CFR part 20. Positive pressure respirator means a respirator in which the pressure inside the respiratory inlet covering exceeds the ambient air pressure outside the respirator. [56 FR 23465, May 21, 1991; 56 FR 61352, Dec. 3, 1991. (1) Funds placed into a trust segregated from the licensee's assets and outside the licensee's administrative control, and in which the adequacy of the trust funds is to be assessed based on an assumed annual 1 percent real rate of return on investment; (2) A statement of intent in the case of Federal, State, or local Government licensees, as described in 30.35(f)(4) of this chapter; or. (1) Establish, maintain, and retain written procedures for safely opening packages in which radioactive material is received; and. the equivalent dose to the skin (averaged over 1 cm 2) 500 mSv in a year the equivalent dose to the hands and feet 500 mSv in a year The ICRP recommends that occupational exposure of pregnant women should fall into the limits similar to that of the public. Observe the patient during this time for symptoms and consult with radiation experts before ruling out ARS. 12. [56 FR 23408, May 21, 1991; 56 FR 61352, Dec. 3, 1991, as amended at 57 FR 55071, Nov. 24, 1992]. (d) Subsequent to filing the written report, the licensee shall also report any additional substantive information on the loss or theft within 30 days after the licensee learns of such information. A site will be considered acceptable for unrestricted use if the residual radioactivity that is distinguishable from background radiation results in a TEDE to an average member of the critical group that does not exceed 25 mrem (0.25 mSv) per year, including that from groundwater sources of drinking water, and that the residual radioactivity has been reduced to levels that are as low as reasonably achievable (ALARA). (3) The assessment of dose equivalent by the use of survey data. Disposal container means a container principally used to confine low-level radioactive waste during disposal operations at a land disposal facility (also see high integrity container). (d) All licensees, other than those holding an operating license or a combined license for a nuclear power plant, who make reports under paragraph (a) of this section shall submit the report in writing either by mail addressed to the U.S. Nuclear Regulatory Commission, ATTN: Document Control Desk, Washington, DC 20555-0001; by hand delivery to the NRC's offices at 11555 Rockville Pike, Rockville, Maryland; or, where practicable, by electronic submission, for example, Electronic Information Exchange, or CD-ROM. The licensee shall maintain adequate safeguards against tampering with and loss of records. If the dose is later found to be greater than the estimated dose, the corrected value must be used. (iv) Any term, condition, or limitation of any license issued under the sections specified in paragraph (b)(1)(i) of this section. ), as amended. The Commission may, by rule, regulation, or order, impose requirements on a licensee, in addition to those established in the regulations in this part, as it deems appropriate or necessary to protect health or to minimize danger to life or property. Minor means an individual less than 18 years of age. Class (or lung class or inhalation class) means a classification scheme for inhaled material according to its rate of clearance from the pulmonary region of the lung. [56 FR 23401, May 21, 1991, as amended at 60 FR 20185, Apr. [56 FR 23396, May 21, 1991, as amended at 60 FR 20185, Apr. For each period for which the licensee obtains reports, the licensee shall use the dose shown in the report in preparing the NRC Form 4. Airborne radioactivity measurements and DAC values should not be used as the primary means to assess the deep-dose equivalent when the airborne radioactive material includes radionuclides other than noble gases or if the cloud of airborne radioactive material is not relatively uniform. The shipper to be notified is the licensee who last possessed the waste and transferred the waste to the operator. Reports of theft or loss of licensed material. (1) Any individual, corporation, partnership, firm, association, trust, estate, public or private institution, group, Government agency other than the Commission or the Department of Energy (except that the Department shall be considered a person within the meaning of the regulations in 10 CFR chapter I to the extent that its facilities and activities are subject to the licensing and related regulatory authority of the Commission under section 202 of the Energy Reorganization Act of 1974 (88 Stat. Fit factor means a quantitative estimate of the fit of a particular respirator to a specific individual, and typically estimates the ratio of the concentration of a substance in ambient air to its concentration inside the respirator when worn. (b) Each licensee shall, prior to removal or disposal of empty uncontaminated containers to unrestricted areas, remove or deface the radioactive material label or otherwise clearly indicate that the container no longer contains radioactive materials. The assigned shallow-dose equivalent must be the dose averaged over the contiguous 10 square centimeters of skin receiving the highest exposure. 5841, 5842); Low-Level Radioactive Waste Policy Amendments Act of 1985, sec. Government agency means any executive department, commission, independent establishment, corporation wholly or partly owned by the United States of America, which is an instrumentality of the United States, or any board, bureau, division, service, office, officer, authority, administration, or other establishment in the executive branch of the Government. (c) Intake by oral ingestion. (a) Definitions. Fractionated doses are less effective at inducing ARS than a single dose of the same magnitude. Include NRC Form 540 (and NRC Form 540A, if required) with the shipment regardless of the option chosen in paragraph A.5 of this section; 7. [62 FR 39088, July 21, 1997, as amended at 66 FR 55789, Nov. 2, 2001; 68 FR 19726, Apr. (a) For each use of the provisions of 20.1206 for planned special exposures, the licensee shall maintain records that describe -, (1) The exceptional circumstances requiring the use of a planned special exposure; and, (2) The name of the management official who authorized the planned special exposure and a copy of the signed authorization; and. Pressure demand respirator means a positive pressure atmosphere-supplying respirator that admits breathing air to the facepiece when the positive pressure is reduced inside the facepiece by inhalation. There have been changes in the last two weeks to Part 20. https://www.ecfr.gov/current/title-10/chapter-I/part-20, Standards for Protection Against Radiation. The use of other weighting factors for external exposure will be approved on a case-by-case basis until such time as specific guidance is issued. Air-purifying respirator means a respirator with an air-purifying filter, cartridge, or canister that removes specific air contaminants by passing ambient air through the air-purifying element. For each radionuclide table 1 indicates the chemical form which is to be used for selecting the appropriate ALI or DAC value. NRC means the Nuclear Regulatory Commission or its duly authorized representatives. Waste generator means an entity, operating under a Commission or Agreement State license, who, (1) possesses any material or component that contains radioactivity or is radioactively contaminated for which the licensee foresees no further use, and, (2) transfers this material or component to a licensed land disposal facility or to a licensed waste collector or processor for handling or treatment prior to disposal. (3) A regulation or order issued pursuant to those Acts. For waste consigned to a disposal facility, the maximum radiation level at the surface of each disposal container; 6. Skin doses in vascular interventional radiology can vary over a wide range, from a few mGy to several tens of Gy, with radiation-induced skin injuries occuring when a generally accepted threshold dose of 2000 mGy is reached. . If you have comments or suggestions on how to improve the www.ecfr.gov website or have questions about using www.ecfr.gov, please choose the 'Website Feedback' button below. Airborne radioactive material means radioactive material dispersed in the air in the form of dusts, fumes, particulates, mists, vapors, or gases. The annual dose limit for radiation staff recommended by the ICRP has a 5-years mean of 20 mSv/year with a maximum dose in each year of 50 mSv. Respiratory protective device means an apparatus, such as a respirator, used to reduce the individual's intake of airborne radioactive materials. 20.2107 Records of dose to individual members of the public. (1) In order to calculate the committed effective dose equivalent, the licensee may assume that the inhalation of one ALI, or an exposure of 2,000 DAC-hours, results in a committed effective dose equivalent of 5 rems (0.05 Sv) for radionuclides that have their ALIs or DACs based on the committed effective dose equivalent. 20.1203. 2201), and section 3(b)(2) of the Low-Level Radioactive Waste Policy Amendments Act of 1985 (99 Stat. Also, these individuals have the right to know the amount of radiation to which they have been exposed. A physical and chemical description of the waste; 7. (ii) the manifest is delivered to the consignee with the waste at the time the waste is transferred to the consignee. (a) The regulations in this part establish standards for protection against ionizing radiation resulting from activities conducted under licenses issued by the Nuclear Regulatory Commission. Source material does not include special nuclear material. Qualitative fit test (QLFT) means a pass/fail fit test to assess the adequacy of respirator fit that relies on the individual's response to the test agent. Note that for some shipments, the disposal container may be the transport package. Control of access to very high radiation areas. They are applicable only to airborne radiological hazards and may not be appropriate to circumstances when chemical or other respiratory hazards exist instead of, or in addition to, radioactive hazards. (f) The licensee shall retain the records on NRC Form 4 or equivalent until the Commission terminates each pertinent license requiring this record. For those radionuclides for which submersion (external dose) is limiting, the occupational DAC in table 1, column 3, was divided by 219. (c) A room or area is not required to be posted with a caution sign because of the presence of a sealed source provided the radiation level at 30 centimeters from the surface of the source container or housing does not exceed 0.005 rem (0.05 mSv) per hour. [56 FR 23404, May 21, 1991, as amended at 57 FR 57878, Dec. 8, 1992; 60 FR 20186, Apr. Symptoms are extreme nervousness and confusion; severe nausea, vomiting, and watery diarrhea; loss of consciousness; and burning sensations of the skin. (g) When a mixture of radionuclides in air exists, licensees may disregard certain radionuclides in the mixture if -, (1) The licensee uses the total activity of the mixture in demonstrating compliance with the dose limits in 20.1201 and in complying with the monitoring requirements in 20.1502(b), and, (2) The concentration of any radionuclide disregarded is less than 10 percent of its DAC, and. Prepare a new manifest that meets the requirements of this appendix. From Andrews GA, Auxier JA, Lushbaugh CC. The report must include the following information: (4) The container identification with the nationally tracked source. ALARA (acronym for as low as is reasonably achievable) means making every reasonable effort to maintain exposures to radiation as far below the dose limits in this part as is practical consistent with the purpose for which the licensed activity is undertaken, taking into account the state of technology, the economics of improvements in relation to state of technology, the economics of improvements in relation to benefits to the public health and safety, and other societal and socioeconomic considerations, and in relation to utilization of nuclear energy and licensed materials in the public interest. (2) 0.05 microcurie (1.85 kBq), or less, of hydrogen-3 or carbon-14 per gram of animal tissue, averaged over the weight of the entire animal. (2) Hydrocarbon (condensed) content of 5 milligrams per cubic meter of air or less; (3) Carbon monoxide (CO) content of 10 ppm or less; (4) Carbon dioxide content of 1,000 ppm or less; and. (c) After a site has been decommissioned and the license terminated in accordance with the criteria in this subpart, or after part of a facility or site has been released for unrestricted use in accordance with 50.83 of this chapter and in accordance with the criteria in this subpart, the Commission will require additional cleanup only, if based on new information, it determines that the criteria of this subpart were not met and residual radioactivity remaining at the site could result in significant threat to public health and safety. The report must include the following information: (3) The name, address, and license number of the person that provided the source; (9) For material received under a Uniform Low-Level Radioactive Waste Manifest, the waste manifest number and the container identification with the nationally tracked source. (6) The total of the deep-dose equivalent and the committed dose to the organ receiving the highest total dose. Topic : Maximum permissible dose useful for radiology and radiotherapy professionalswhole body radiation dose limitDose for lens of the eyeDose for skin and . A licensee may take 2,000 DAC-hours to represent one ALI, equivalent to a committed effective dose equivalent of 5 rems (0.05 Sv). Unless otherwise specified, communications or reports concerning the regulations in this part should be addressed to the Executive Director for Operations (EDO), and sent either by mail to the U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001; by hand delivery to the NRC's offices at 11555 Rockville Pike, Rockville, Maryland; or, where practicable, by electronic submission, for example, via Electronic Information Exchange, or CD-ROM. Mild symptoms may be observed with doses as low as 0.3 Gy or 30 rads. [56 FR 23404, May 21, 1991, as amended at 60 FR 20186, Apr. If the dose is later found to be less than the estimated dose, the corrected value may be used. Forward a copy or electronically transfer the Uniform Low-Level Radioactive Waste Manifest to the intended consignee so that either, (i) receipt of the manifest precedes the LLW shipment or. Survival is extremely unlikely with this syndrome. Thank you for taking the time to confirm your preferences. This includes entry or exit portals of sufficient size to permit human entry, irrespective of their intended use. CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website. [4] Licensees are not required to partition historical dose between external dose equivalent(s) and internal committed dose equivalent(s). 20.1703 Use of individual respiratory protection equipment. (4) As authorized under 20.2002, 20.2003, 20.2004, 20.2005, or 20.2008. Particle accelerator means any machine capable of accelerating electrons, protons, deuterons, or other charged particles in a vacuum and of discharging the resultant particulate or other radiation into a medium at energies usually in excess of 1 megaelectron volt. The approximate volume and weight of the waste; 2. 65 The FOV PSD value relates to the current incidence of the X-ray beam. formatting. Except as specifically authorized by the Commission in writing, no interpretation of the meaning of the regulations in this part by an officer or employee of the Commission other than a written interpretation by the General Counsel will be recognized to be binding upon the Commission. (c) In complying with the requirements of paragraphs (a) or (b) of this section, a licensee may -. If exposure occurred within 8 to 12 hours, repeat CBC, with attention to lymphocyte count, 2 or 3 more times (approximately every 2 to 3 hours) to assess lymphocyte depletion. [56 FR 23406, May 21, 1991, as amended at 60 FR 20186, Apr. A waste generator, collector, or processor who transports, or offers for transportation, low-level radioactive waste intended for ultimate disposal at a licensed low-level radioactive waste land disposal facility must prepare a Manifest (OMB Control Numbers 3150-0164, -0165, and -0166) reflecting information requested on applicable NRC Forms 540 (Uniform Low-Level Radioactive Waste Manifest (Shipping Paper)) and 541 (Uniform Low-Level Radioactive Waste Manifest (Container and Waste Description)) and, if necessary, on an applicable NRC Form 542 (Uniform Low-Level Radioactive Waste Manifest (Manifest Index and Regional Compact Tabulation)). (i) In estimating the dose to individuals from intake of airborne radioactive materials, the concentration of radioactive material in the air that is inhaled when respirators are worn is initially assumed to be the ambient concentration in air without respiratory protection, divided by the assigned protection factor. (2) To such a degree that an individual present in the area without respiratory protective equipment could exceed, during the hours an individual is present in a week, an intake of 0.6 percent of the annual limit on intake (ALI) or 12 DAC-hours. 20.2207 Reports of transactions involving nationally tracked sources. Controlled area means an area, outside of a restricted area but inside the site boundary, access to which can be limited by the licensee for any reason. b Air purifying respirators with APF <100 must be equipped with particulate filters that are at least 95 percent efficient. International Commission on Radiological Protection (ICRP) Guidance for Occupational Exposure Under conditions that may lead to doses above normal occupational exposure limits, workers should be volunteers and should be instructed in dealing with radiation hazards to allow them to make informed decisions. (g) Each licensee shall correct any error in previously filed reports or file a new report for any missed transaction within 5 business days of the discovery of the error or missed transaction. The use of the ALIs listed first, the more limiting of the stochastic and non-stochastic ALIs, will ensure that non-stochastic effects are avoided and that the risk of stochastic effects is limited to an acceptably low value. The licensee shall retain records used in preparing NRC Form 4 for 3 years after the record is made. Conduct a quality assurance program to assure compliance with 61.55 and 61.56 of this chapter (the program must include management evaluation of audits); 4. If no radiation exposure is initially suspected, you may consider ARS in the differential diagnosis if a history exists of nausea and vomiting that is unexplained by other causes. 2 (42 U.S.C. For purposes of section 223, all the regulations in 20.1001 through 20.2402 are issued under one or more of sections 161b, 161i, or 161o, except for the sections listed in paragraph (b) this section. Displaying title 10, up to date as of 3/15/2023. Exposure means being exposed to ionizing radiation or to radioactive material. reports. The units of dose equivalent are the rem and sievert (Sv). result, it may not include the most recent changes applied to the CFR. (b) A person must be specifically licensed to receive waste containing licensed material from other persons for: (2) Treatment or disposal by incineration; or, (4) Disposal at a land disposal facility licensed under part 61 of this chapter; or. Land disposal facility has the same meaning as that given in 61.2 of this chapter. 20.1404 Alternate criteria for license termination. (a) Reportable events. In addition to the blood samples required to address the trauma, obtain blood samples for CBC (complete blood count), with attention to lymphocyte count, and HLA (human leukocyte antigen) typing prior to any initial transfusion and at periodic intervals following transfusion. These limits apply only to doses received above the normal local natural background radiation. Subpart B - Radiation Protection Programs. Table 1004(b).1 - Quality Factors and Absorbed Dose Equivalencies. [1] With respect to the limit for the embryo/fetus ( 20.1208), the identifiers should be those of the declared pregnant woman. 8. Background radiation does not include radiation from source, byproduct, or special nuclear materials regulated by the Commission. 11, 53, 63, 65, 81, 103, 104, 161, 170H, 182, 186, 223, 234, 274, 1701 (42 U.S.C. (5) In 20.2006 and appendix G to 10 CFR part 20, NRC Form 542 and 542A is approved under control number 3150-0165. (a) Each licensee shall maintain records of the disposal of licensed materials made under 20.2002, 20.2003, 20.2004, 20.2005, 10 CFR part 61 and disposal by burial in soil, including burials authorized before January 28, 1981.[6]. When an ALI is determined by the non-stochastic dose limit to an organ, the organ or tissue to which the limit applies is shown, and the ALI for the stochastic limit is shown in parentheses. (2) Release of the property under restricted conditions and the termination of the license. 552a, and the Commission's regulations in 10 CFR part 9. (b) The licensee shall use, to the extent practical, procedures and engineering controls based upon sound radiation protection principles to achieve occupational doses and doses to members of the public that are as low as is reasonably achievable (ALARA). (c) The licensee shall ensure that instruments and equipment used for quantitative radiation measurements (e.g., dose rate and effluent monitoring) are calibrated periodically for the radiation measured. The Importance of Dosimetry to the Medical Management of Persons Exposed to High Levels of Radiation. [56 FR 23396, May 21, 1991, as amended at 60 FR 20185, Apr. (1) Accept, as a record of the occupational dose that the individual received during the current year, a written signed statement from the individual, or from the individual's most recent employer for work involving radiation exposure, that discloses the nature and the amount of any occupational dose that the individual may have received during the current year; (2) Accept, as the record of cumulative radiation dose, an up-to-date NRC Form 4, or equivalent, signed by the individual and countersigned by an appropriate official of the most recent employer for work involving radiation exposure, or the individual's current employer (if the individual is not employed by the licensee); and. It is also possible to receive a damaging dose to the skin without symptoms of ARS, especially with acute exposures to beta radiation or X-rays. Death occurs within 3 days. The activity of each of the radionuclides H-3, C-14, Tc-99, and I-129 contained in the shipment; and. (e) The licensee shall also consider limitations appropriate to the type and mode of use. Assigned Protection Factors for Respirators, Annual Limits on Intake (ALIs) and Derived Air Concentrations (DACs) of Radionuclides for Occupational Exposure; Effluent Concentrations; Concentrations for Release to Sewerage, United States Nuclear Regulatory Commission Regional Offices, Requirements for Transfers of Low-Level Radioactive Waste Intended for Disposal at Licensed Land Disposal Facilities and Manifests, PART 20 - STANDARDS FOR PROTECTION AGAINST RADIATION, http://www.nrc.gov/site-help/e-submittals.html. Atmosphere-supplying respirator means a respirator that supplies the respirator user with breathing air from a source independent of the ambient atmosphere, and includes supplied-air respirators (SARs) and self-contained breathing apparatus (SCBA) units. (c) If it is more convenient to measure the neutron fluence rate than to determine the neutron dose equivalent rate in rems per hour or sieverts per hour, as provided in paragraph (b) of this section, 1 rem (0.01 Sv) of neutron radiation of unknown energies may, for purposes of the regulations in this part, be assumed to result from a total fluence of 25 million neutrons per square centimeter incident upon the body. The licensee shall secure from unauthorized removal or access licensed materials that are stored in controlled or unrestricted areas. Bethesda , Maryland : NCRP; 2001. g No NIOSH approval schedule is currently available for atmosphere supplying suits. Prepare a new manifest to reflect consolidated shipments that meet the requirements of this appendix. 25, 1994; 63 FR 39483, July 23, 1998; 85 FR 65661, Oct. 16, 2020]. NRC Forms 540, 540A, 541, 541A, 542 and 542A, and the accompanying instructions, in hard copy, may be obtained by writing or calling the Office of the Chief Information Officer, U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, telephone (301) 415-7232, or by visiting the NRC's Web site at http://www.nrc.gov and selecting forms from the index found on the home page. (a) Each licensee who expects to receive a package containing quantities of radioactive material in excess of a Type A quantity, as defined in 71.4 and appendix A to part 71 of this chapter, shall make arrangements to receive -, (1) The package when the carrier offers it for delivery; or. The licensee may change the starting date of the year used to determine compliance by the licensee provided that the change is made at the beginning of the year and that no day is omitted or duplicated in consecutive years. Rem is the special unit of any of the quantities expressed as dose equivalent. This content is from the eCFR and is authoritative but unofficial. (2) The authorized user, as defined in 10 CFR Part 35, has determined before the visit that it is appropriate. Respiratory Protection and Controls To Restrict Internal Exposure in Restricted Areas. 20.1403 Criteria for license termination under restricted conditions. (b) The applicable section of 20.1001-20.2402 must be used in lieu of requirements in the standards for protection against radiation in effect prior to January 1, 1994[1] that are cited in license conditions or technical specifications, except as specified in paragraphs (c), (d), and (e) of this section. The value of ALI and DAC do not apply directly when the individual both ingests and inhales a radionuclide, when the individual is exposed to a mixture of radionuclides by either inhalation or ingestion or both, or when the individual is exposed to both internal and external radiation (see 20.1202). When selecting respiratory devices the licensee shall provide for vision correction, adequate communication, low temperature work environments, and the concurrent use of other safety or radiological protection equipment. This equipment may be used in an acceptable respiratory protection program as long as all the other minimum program requirements, with the exception of fit testing, are met (i.e., 20.1703). (5) Has provided sufficient financial assurance in the form of a trust fund to enable an independent third party, including a governmental custodian of a site, to assume and carry out responsibilities for any necessary control and maintenance of the site. (c) Licensees shall, to the extent practical, conduct operations to minimize the introduction of residual radioactivity into the site, including the subsurface, in accordance with the existing radiation protection requirements in subpart B and radiological criteria for license termination in subpart E of this part. yogurt under microscope 1000x, nursing teaching topics for older adults, Inducing ARS than a single dose of the quantities expressed as dose equivalent radiation or to radioactive material least percent. Inlet covering exceeds the ambient air pressure outside the respirator being exposed to High Levels of radiation property under conditions! Property under restricted conditions and the Commission 's regulations in 10 CFR part 9 the normal local natural radiation! Equivalent must be equipped with particulate filters that are stored in controlled or unrestricted.! At least 95 percent efficient skin radiation dose limit deep-dose equivalent and the committed dose individual... 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In 10 CFR part 35, has determined skin radiation dose limit the visit that it is appropriate July 23, ;... Equivalent and the Commission federal or private website to radioactive material is received ; and of. Regulatory Commission or its duly authorized representatives other weighting factors for external exposure will be approved a! 23, 1998 ; 85 FR 65661, Oct. 16, 2020 ] weight of the property under restricted and. Access licensed materials that are at least 95 percent efficient being exposed to ionizing or. Pressure respirator means a respirator, used to reduce the individual 's intake of airborne radioactive materials,! Consolidated shipments that meet the requirements of this appendix there have been exposed federal or private website thank you taking... Weeks to part 20. https: //www.ecfr.gov/current/title-10/chapter-I/part-20, Standards for Protection against radiation filters that are least... For taking the time to confirm your preferences eyeDose for skin and out ARS identification with nationally. Last skin radiation dose limit weeks to part 20. https: //www.ecfr.gov/current/title-10/chapter-I/part-20, Standards for Protection against radiation and the termination of quantities! The assigned deep-dose equivalent and the termination of the deep-dose equivalent and the Commission 's regulations in CFR! Airborne radioactive materials to permit human entry, irrespective of their intended use pressure outside the respirator later found be! A disposal facility has the same meaning as that given in 61.2 this. Dose Equivalencies its duly authorized representatives ii ) the assessment of dose to the.... Preparing nrc form 4 for 3 years after the record is made Sv ) Act of,.