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1- The objective of this specific regulation is to provide specific criteria, conversion factors and pa-rameters to support the verification of compliance with the dose limit established in the Regula-tion on Radiation Safety (NRRC-R-01).
2. This specific regulation shall apply to assessing the occupational and public exposure in planned exposure situations with the purpose of verifying compliance with dose limits.
Committed effective dose, E(τ)
The quantity 𝐸(𝜏), defined as:
where 𝐻T(𝜏) is the committed equivalent dose to tissue or organ T over the integration time 𝜏 elapsed after an intake of radioactive substances and 𝑤T is the tissue weighting factor for tissue or organ T. When 𝜏 is not specified, it will be taken to be 50 years for adults and the time to age 70 years for intakes by children.
Directional dose equivalent, H΄(d,Ω)
The dose equivalent that would be produced by the corresponding expanded field in the International Commission on Radiation Units and Measurements ICRU sphere at a depth d on a radius in a specified direction Ω.
The quantity K, defined as:
where dEtr is the sum of the initial kinetic energies of all charged ionizing particles liberated by uncharged ionizing particles in a material of mass dm.
air kerma. The kerma value for air.
reference air kerma rate.
The kerma rate to air, in air, at a reference distance of 1 m, corrected for air attenuation and scattering.
Particle fluence, Φ.
A measure of the density of particles in a radiation field, defined as:
where dN is the number of particles incident on a sphere of cross-sectional area da.
Personal dose equivalent, Hp(d)
The dose equivalent in soft tissue below a specified point on the body at an appropriate depth d.
-'Soft tissue' is commonly interpreted as the International Commission on Radiation Units and Measurements ICRU sphere.
3. The effective dose limits specified in the Safety Regulation NRRC-R-01 shall apply to the sum of the relevant doses from external exposure in the specified period and the relevant committed doses from intakes in the same period; the period for calculating the committed dose shall nor-mally be 50 years for intakes by adults and shall be up to age 70 years for intakes by children.
4. For occupational exposure, the Personal Dose Equivalent Hp (10) may be used as an approxima-tion of the Effective Dose from external exposure to penetrating radiation.
5. The equivalent dose limits for the skin apply to the average dose over 1 cm2 of the most highly ir-radiated area of the skin. The dose to the skin also contributes to the effective dose. This contri-bution is the average dose to the entire skin multiplied by the tissue weighting factor for the skin.
6. Values of the Effective Dose per unit air kerma free-in-air and per unit particle fluence are given in Tables I.A – I.D.
7. Doses per unit intake (dose coefficients) for the estimation of the Committed Effective Dose for ingestion and inhalation of radionuclides are given in Tables II.A – II. H.
TABLE I.C. EFFECTIVE DOSE PER UNIT NEUTRON FLUENCE E/Φ FOR MONOENERGETIC NEUTRONS INCIDENT IN INTERNATIONAL ORGANIZATION FOR STANDARDIZATION GEOMETRY ON AN ADULT ANTHROPOMORPHIC COMPUTATIONAL PHANTOM
TABLE I.D. REFERENCE CONVERSION COEFFICIENTS FROM FLUENCE TO DIRECTIONAL DOSE EQUIVALENT FOR MONOENERGETIC ELECTRONS AND NORMAL INCIDENCE
TABLE II.A. WORKERS: COMMITTED EFFECTIVE DOSE PER UNIT INTAKE e(g) VIA INHALATION AND INGESTION (Sv/Bq)
TABLE II.B. COMPOUNDS AND VALUES OF GUT TRANSFER FACTOR f1 USED TO CALCULATE COMMITTED EFFECTIVE DOSE PER UNIT INTAKE VIA INGESTION FOR WORKERS
TABLE II.C. COMPOUNDS, LUNG ABSORPTION TYPES AND VALUES OF GUT TRANSFER FACTOR f1 USED TO CALCULATE COMMITTED EFFECTIVE DOSE PER UNIT INTAKE VIA INHALATION FOR WORKERS
TABLE II.D. MEMBERS OF THE PUBLIC: COMMITTED EFFECTIVE DOSE PER UNIT INTAKE e(g) VIA INGESTION (Sv/Bq)
TABLE II.E. MEMBERS OF THE PUBLIC: COMMITTED EFFECTIVE DOSE PER UNIT INTAKE e(g) VIA INHALATION
TABLE II.F. LUNG ABSORPTION TYPES USED TO CALCULATE COMMITTED EFFECTIVE DOSE PER UNIT INTAKE VIA INHALATION FOR EXPOSURE DUE TO PARTICULATE AEROSOLS OR DUE TO GASES AND VAPOURS FOR MEMBERS OF THE PUBLIC
TABLE II.G. INHALATION: COMMITTED EFFECTIVE DOSE PER UNIT INTAKE e(g) (Sv/Bq) FOR SOLUBLE OR REACTIVE GASES AND VAPOURS
TABLE III.2H. EFFECTIVE DOSE RATE FOR EXPOSURE DUE TO INERT GASES FOR ADULTSa
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