40 CFR Appendix B to Part 191, Calculation of Annual Committed Effective Dose

Appendix B to Part 191 - Calculation of Annual Committed Effective Dose
I. Equivalent Dose

The calculation of the committed effective dose (CED) begins with the determination of the equivalent dose, HT, to a tissue or organ, T, listed in Table B.2 below by using the equation:

where DT, R is the absorbed dose in rads (one gray, an SI unit, equals 100 rads) averaged over the tissue or organ, T, due to radiation type, R, and wR is the radiation weighting factor which is given in Table B.1 below. The unit of equivalent dose is the rem (sievert, in SI units).

Table B.1 - Radiation Weighting Factors, wR1

Radiation type and energy range 2 wR value
Photons, all energies 1
Electrons and muons, all energies 1
Neutrons, energy <10 keV 5
10 keV to 100 keV 10
>100 keV to 2 MeV 20
>2 MeV to 20 MeV 10
>20 MeV 5
Protons, other than recoil protons, >2 MeV 5
Alpha particles, fission fragments, heavy nuclei 20

1 All values relate to the radiation incident on the body or, for internal sources, emitted from the source.

2 See paragraph A14 in ICRP Publication 60 for the choice of values for other radiation types and energies not in the table.

II. Effective Dose

The next step is the calculation of the effective dose, E. The probability of occurrence of a stochastic effect in a tissue or organ is assumed to be proportional to the equivalent dose in the tissue or organ. The constant of proportionality differs for the various tissues of the body, but in assessing health detriment the total risk is required. This is taken into account using the tissue weighting factors, wT in Table B.2, which represent the proportion of the stochastic risk resulting from irradiation of the tissue or organ to the total risk when the whole body is irradiated uniformly and HT is the equivalent dose in the tissue or organ, T, in the equation:

Table B.2 - Tissue Weighting Factors, wT1

Tissue or organ wT value
Gonads 0.25
Breast 0.15
Red bone marrow 0.12
Lung 0.12
Thyroid 0.03
Bone surfaces 0.03
Remainder 2 0.30

1 The values are considered to be appropriate for protection for individuals of both sexes and all ages.

2 For purposes of calculation, the remainder is comprised of the five tissues or organs not specifically listed in Table B.2 that receive the highest dose equivalents; a weighting factor of 0.06 is applied to each of them, including the various sections of the gastrointestinal tract which are treated as separate organs. This covers all tissues and organs except the hands and forearms, the feet and ankles, the skin and the lens of the eye. The excepted tissues and organs should be excluded from the computation of HE.

III. Annual Committed Tissue or Organ Equivalent Dose

For internal irradiation from incorporated radionuclides, the total absorbed dose will be spread out in time, being gradually delivered as the radionuclide decays. The time distribution of the absorbed dose rate will vary with the radionuclide, its form, the mode of intake and the tissue within which it is incorporated. To take account of this distribution the quantity committed equivalent dose, HΤ(τ) where is the integration time in years following an intake over any particular year, is used and is the integral over time of the equivalent dose rate in a particular tissue or organ that will be received by an individual following an intake of radioactive material into the body. The time period, τ, is taken as 50 years as an average time of exposure following intake:

for a single intake of activity at time t0 where HT(t) is the relevant equivalent-dose rate in a tissue or organ at time t. For the purposes of this part, the previously mentioned single intake may be considered to be an annual intake.
IV. Annual Committed Effective Dose

If the committed equivalent doses to the individual tissues or organs resulting from an annual intake are multiplied by the appropriate weighting factors, wT, and then summed, the result will be the annual committed effective dose, E(τ):

[ 58 FR 66415, Dec. 20, 1993]

This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.

This list is taken from the Parallel Table of Authorities and Rules provided by GPO [Government Printing Office].

It is not guaranteed to be accurate or up-to-date, though we do refresh the database weekly. More limitations on accuracy are described at the GPO site.


United States Code
U.S. Code: Title 5 - APPENDIX
U.S. Code: Title 42 - THE PUBLIC HEALTH AND WELFARE

§ 2011 - Congressional declaration of policy

§ 2012 - Congressional findings

§ 2013 - Purpose of chapter

§ 2014 - Definitions

§ 2015 - Transfer of property

§ 2015a - Cold standby

§ 2015b - Scholarship and fellowship program

§ 2015c - Partnership program with institutions of higher education

§ 2016 - Repealed. Pub. L. 105–85, div. C, title XXXI, § 3152(a)(1), Nov. 18, 1997, 111 Stat. 2042

§ 2017 - Authorization of appropriations

§ 2017a - Omitted

§ 2017a-1

§ 2017b - Omitted

§ 2018 - Agency jurisdiction

§ 2019 - Applicability of Federal Power Act

§ 2020 - Licensing of Government agencies

§ 2021 - Cooperation with States

§ 2021a - Storage or disposal facility planning

§ 2021b - Definitions

§ 2021c - Responsibilities for disposal of low-level radioactive waste

§ 2021d - Regional compacts for disposal of low-level radioactive waste

§ 2021e - Limited availability of certain regional disposal facilities during transition and licensing periods

§ 2021f - Emergency access

§ 2021g - Responsibilities of Department of Energy

§ 2021h - Alternative disposal methods

§ 2021i - Licensing review and approval

§ 2021j - Radioactive waste below regulatory concern

§ 2022 - Health and environmental standards for uranium mill tailings

§ 2023 - State authority to regulate radiation below level of regulatory concern of Nuclear Regulatory Commission

§ 2031, 2032 - Repealed. Pub. L. 93–438, title I, § 104(a), Oct. 11, 1974, 88 Stat. 1237

§ 2033 - Principal office

§ 2034 - General Manager, Deputy and Assistant General Managers

§ 2035 - Divisions, offices, and positions

§ 2036 - Repealed. Pub. L. 95–91, title VII, § 709(c)(1), Aug. 4, 1977, 91 Stat. 608

§ 2037 - Repealed. Pub. L. 99–661, div. C, title I, § 3137(c), Nov. 14, 1986, 100 Stat. 4066

§ 2038 - Appointment of Army, Navy, or Air Force officer as Assistant General Manager for Military Application; Chairman of Military Liaison Committee; compensation

§ 2039 - Advisory Committee on Reactor Safeguards; composition; tenure; duties; compensation

§ 2040 - Fellowship program of Advisory Committee on Reactor Safeguards; selection of fellowships

§ 2051 - Research and development assistance

§ 2052 - Research by Commission

§ 2053 - Research for others; charges

§ 2061 - Production facilities

§ 2062 - Irradiation of materials

§ 2063 - Acquisition of production facilities

§ 2064 - Disposition of energy; regulation on sale

§ 2071 - Determination of other material as special nuclear material; Presidential assent; effective date

§ 2072 - Repealed. Pub. L. 88–489, § 4, Aug. 26, 1964, 78 Stat. 603

§ 2073 - Domestic distribution of special nuclear material

§ 2074 - Foreign distribution of special nuclear material

§ 2075 - Acquisition of special nuclear material; payments; just compensation

§ 2076 - Guaranteed purchase prices

§ 2077 - Unauthorized dealings in special nuclear material

§ 2078 - Congressional review of guaranteed purchase price, guaranteed purchase price period, and criteria for waiver of charges

§ 2091 - Determination of source material

§ 2092 - License requirements for transfers

§ 2093 - Domestic distribution of source material

§ 2094 - Foreign distribution of source material

§ 2095 - Reports

§ 2096 - Acquisition of source material; payments

§ 2097 - Operations on lands belonging to United States

§ 2098 - Public and acquired lands

§ 2099 - Prohibitions against issuance of license

§ 2111 - Domestic distribution

§ 2112 - Foreign distribution of byproduct material

§ 2113 - Ownership and custody of certain byproduct material and disposal sites

§ 2114 - Authorities of Commission respecting certain byproduct material

§ 2121 - Authority of Commission

§ 2122 - Prohibitions governing atomic weapons

§ 2122a - Repealed. Pub. L. 106–65, div. C, title XXXII, § 3294(e)(1)(A), Oct. 5, 1999, 113 Stat. 970

§ 2123 - Transferred

§ 2131 - License required

§ 2132 - Utilization and production facilities for industrial or commercial purposes

§ 2133 - Commercial licenses

§ 2134 - Medical, industrial, and commercial licenses

§ 2135 - Antitrust provisions governing licenses

§ 2136 - Classes of facilities

§ 2137 - Operators’ licenses

§ 2138 - Suspension of licenses during war or national emergency

§ 2139 - Component and other parts of facilities

§ 2139a - Regulations implementing requirements relating to licensing for components and other parts of facilities

§ 2140 - Exclusions from license requirement

§ 2141 - Licensing by Nuclear Regulatory Commission of distribution of special nuclear material, source material, and byproduct material by Department of Energy

§ 2151 - Effect of international arrangements

§ 2152 - Policies contained in international arrangements

§ 2153 - Cooperation with other nations

§ 2153a - Approval for enrichment after export of source or special nuclear material; export of major critical components of enrichment facilities

§ 2153b - Export policies relating to peaceful nuclear activities and international nuclear trade

§ 2153c - Renegotiation of agreements for cooperation

§ 2153d - Authority to continue agreements for cooperation entered into prior to March 10, 1978

§ 2153e - Protection of environment

§ 2153e-1

§ 2153f - Savings clause; Nuclear Non-Proliferation Act of 1978

§ 2154 - International atomic pool

§ 2155 - Export licensing procedures

§ 2155a - Regulations establishing Commission procedures covering grant, suspension, revocation, or amendment of nuclear export licenses or exemptions

§ 2156 - Criteria governing United States nuclear exports

§ 2156a - Regulations establishing levels of physical security to protect facilities and material

§ 2157 - Additional export criterion and procedures

§ 2158 - Conduct resulting in termination of nuclear exports

§ 2159 - Congressional review procedures

§ 2160 - Subsequent arrangements

§ 2160a - Review of Nuclear Proliferation Assessment Statements

§ 2160b - Authority to suspend nuclear cooperation with nations which have not ratified the Convention on the Physical Security of Nuclear Material

§ 2160c - Consultation with Department of Defense concerning certain exports and subsequent arrangements

§ 2160d - Further restrictions on exports

§ 2161 - Policy of Commission

§ 2162 - Classification and declassification of Restricted Data

§ 2163 - Access to Restricted Data

§ 2164 - International cooperation

§ 2165 - Security restrictions

§ 2166 - Applicability of other laws

§ 2167 - Safeguards information

§ 2168 - Dissemination of unclassified information

§ 2169 - Fingerprinting for criminal history record checks

§ 2181 - Inventions relating to atomic weapons, and filing of reports

§ 2182 - Inventions conceived during Commission contracts; ownership; waiver; hearings

§ 2183 - Nonmilitary utilization

§ 2184 - Injunctions; measure of damages

§ 2185 - Prior art

§ 2186 - Commission patent licenses

§ 2187 - Compensation, awards, and royalties

§ 2188 - Monopolistic use of patents

§ 2189 - Federally financed research

§ 2190 - Saving clause for prior patent applications

§ 2201 - General duties of Commission

§ 2201a - Use of firearms by security personnel

§ 2202 - Contracts

§ 2203 - Advisory committees

§ 2204 - Electric utility contracts; authority to enter into; cancellation; submission to Energy Committees

§ 2204a - Fission product contracts

§ 2205 - Contract practices

§ 2205a - Repealed. Pub. L. 97–375, title I, § 115, Dec. 21, 1982, 96 Stat. 1821

§ 2206 - Comptroller General audit

§ 2207 - Claim settlements; reports to Congress

§ 2208 - Payments in lieu of taxes

§ 2209 - Subsidies

§ 2210 - Indemnification and limitation of liability

§ 2210a - Conflicts of interest relating to contracts and other arrangements

§ 2210b - Uranium supply

§ 2210c - Elimination of pension offset for certain rehired Federal retirees

§ 2210d - Security evaluations

§ 2210e - Design basis threat rulemaking

§ 2210f - Recruitment tools

§ 2210g - Expenses authorized to be paid by the Commission

§ 2210h - Radiation source protection

§ 2210i - Secure transfer of nuclear materials

§ 2211 - Payment of claims or judgments for damage resulting from nuclear incident involving nuclear reactor of United States warship; exception; terms and conditions

§ 2212 - Transferred

§ 2213 - Repealed. Pub. L. 109–58, title VI, § 637(b), Aug. 8, 2005, 119 Stat. 791

§ 2214 - NRC user fees and annual charges

§ 2221 - Just compensation for requisitioned property

§ 2222 - Condemnation of real property

§ 2223 - Patent application disclosures

§ 2224 - Attorney General approval of title

§ 2231 - Applicability of administrative procedure provisions; definitions

§ 2232 - License applications

§ 2233 - Terms of licenses

§ 2234 - Inalienability of licenses

§ 2235 - Construction permits and operating licenses

§ 2236 - Revocation of licenses

§ 2237 - Modification of license

§ 2238 - Continued operation of facilities

§ 2239 - Hearings and judicial review

§ 2240 - Licensee incident reports as evidence

§ 2241 - Atomic safety and licensing boards; establishment; membership; functions; compensation

§ 2242 - Temporary operating license

§ 2243 - Licensing of uranium enrichment facilities

§ 2251 to 2257 - Repealed. Aug. 1, 1946, ch. 724, title I, § 302(a), as added Pub. L. 95–110, § 1, Sept. 20, 1977, 91 Stat. 884; renumbered title I, Oct. 24, 1992, Pub. L. 102–486, title IX, § 902(a)(8), 106 Stat. 2944

§ 2258 - Joint Committee on Atomic Energy abolished

§ 2259 - Information and assistance to Congressional committees

§ 2271 - General provisions

§ 2272 - Violation of specific sections

§ 2273 - Violation of sections

§ 2274 - Communication of Restricted Data

§ 2275 - Receipt of Restricted Data

§ 2276 - Tampering with Restricted Data

§ 2277 - Disclosure of Restricted Data

§ 2278 - Statute of limitations

§ 2278a - Trespass on Commission installations

§ 2278b - Photographing, etc., of Commission installations; penalty

§ 2279 - Applicability of other laws

§ 2280 - Injunction proceedings

§ 2281 - Contempt proceedings

§ 2282 - Civil penalties

§ 2282a - Civil monetary penalties for violation of Department of Energy safety regulations

§ 2282b - Civil monetary penalties for violations of Department of Energy regulations regarding security of classified or sensitive information or data

§ 2282c - Worker health and safety rules for Department of Energy nuclear facilities

§ 2283 - Protection of nuclear inspectors

§ 2284 - Sabotage of nuclear facilities or fuel

§ 2286 - Establishment

§ 2286a - Mission and functions of Board

§ 2286b - Powers of Board

§ 2286c - Responsibilities of Secretary of Energy

§ 2286d - Board recommendations

§ 2286e - Reports

§ 2286f - Judicial review

§ 2286g - “Department of Energy defense nuclear facility” defined

§ 2286h - Contract authority subject to appropriations

§ 2286h-1

§ 2286i - Annual authorization of appropriations

§ 2286j - Procurement of inspector general services

§ 2291 - Definitions

§ 2292 - Authorization of appropriations for research and development program; authority to enter into contracts; period of contracts; equivalent amounts for research and development program

§ 2293 - Omitted

§ 2294 - Authorization for sale or lease of uranium and plutonium; amounts; lien for nonpayment; uranium enrichment services

§ 2295 - Acquisition of nuclear materials

§ 2296 - Nonliability of United States; indemnification

§ 10101 - Definitions

§ 10102 - Separability

§ 10103 - Territories and possessions

§ 10104 - Ocean disposal

§ 10105 - Limitation on spending authority

§ 10106 - Protection of classified national security information

§ 10107 - Applicability to atomic energy defense activities

§ 10108 - Applicability to transportation

§ 10121 - State and affected Indian tribe participation in development of proposed repositories for defense waste

§ 10131 - Findings and purposes

§ 10132 - Recommendation of candidate sites for site characterization

§ 10133 - Site characterization

§ 10134 - Site approval and construction authorization

§ 10135 - Review of repository site selection

§ 10136 - Participation of States

§ 10137 - Consultation with States and affected Indian tribes

§ 10138 - Participation of Indian tribes

§ 10139 - Judicial review of agency actions

§ 10140 - Expedited authorizations

§ 10141 - Certain standards and criteria

§ 10142 - Disposal of spent nuclear fuel

§ 10143 - Title to material

§ 10144 - Consideration of effect of acquisition of water rights

§ 10145 - Termination of certain provisions

§ 10151 - Findings and purposes

§ 10152 - Available capacity for interim storage of spent nuclear fuel

§ 10153 - Interim at-reactor storage

§ 10154 - Licensing of facility expansions and transshipments

§ 10155 - Storage of spent nuclear fuel

§ 10156 - Interim Storage Fund

§ 10157 - Transportation

§ 10161 - Monitored retrievable storage

§ 10162 - Authorization of monitored retrievable storage

§ 10163 - Monitored Retrievable Storage Commission

§ 10164 - Survey

§ 10165 - Site selection

§ 10166 - Notice of disapproval

§ 10167 - Benefits agreement

§ 10168 - Construction authorization

§ 10169 - Financial assistance

§ 10171 - Financial arrangements for low-level radioactive waste site closure

§ 10172 - Selection of Yucca Mountain site

§ 10172a - Siting a second repository

§ 10173 - Benefits agreements

§ 10173a - Content of agreements

§ 10173b - Review Panel

§ 10173c - Termination

§ 10174 - Consideration in siting facilities

§ 10174a - Report

§ 10175 - Transportation

§ 10191 - Purpose

§ 10192 - Applicability

§ 10193 - Identification of sites

§ 10194 - Siting research and related activities

§ 10195 - Test and evaluation facility siting review and reports

§ 10196 - Federal agency actions

§ 10197 - Research and development on disposal of high-level radioactive waste

§ 10198 - Research and development on spent nuclear fuel

§ 10199 - Payments to States and Indian tribes

§ 10200 - Study of research and development needs for monitored retrievable storage proposal

§ 10201 - Judicial review

§ 10202 - Research on alternatives for permanent disposal of high-level radioactive waste

§ 10203 - Technical assistance to non-nuclear weapon states in field of spent fuel storage and disposal

§ 10204 - Subseabed disposal

§ 10221 - Mission plan

§ 10222 - Nuclear Waste Fund

§ 10223 - Alternative means of financing

§ 10224 - Office of Civilian Radioactive Waste Management

§ 10225 - Location of test and evaluation facility

§ 10226 - Nuclear Regulatory Commission training authorization

§ 10241 - “State” defined

§ 10242 - Office of Nuclear Waste Negotiator

§ 10243 - Duties of Negotiator

§ 10244 - Environmental assessment of sites

§ 10245 - Site characterization; licensing

§ 10246 - Monitored retrievable storage

§ 10247 - Environmental impact statement

§ 10248 - Administrative powers of Negotiator

§ 10249 - Cooperation of other departments and agencies

§ 10250 - Termination of Office

§ 10251 - Authorization of appropriations

§ 10261 - Definitions

§ 10262 - Nuclear Waste Technical Review Board

§ 10263 - Functions

§ 10264 - Investigatory powers

§ 10265 - Compensation of members

§ 10266 - Staff

§ 10267 - Support services

§ 10268 - Report

§ 10269 - Authorization of appropriations

§ 10270 - Termination of Board

Statutes at Large