A worker has a thyroid dose of 200 mGy from an internally deposited beta emitter and a lung dose of 8 mGy from an internal alpha emitter

A) What is the effective dose??

B) What uniform, whole body dose from thermal neutrons would result in the same effective dose?

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Table 14.1 Radiation Weighting Factors, wg, from NCRP Report No. 116 Radiation X and y rays, electrons, positrons, and muons Neutrons, energy <10 keV 10 keV to 100 keV >100 keV to 2 MeV >2 MeV to 20 MeV >20 MeV Protons, other than recoil protons and energy >2 MeV Alpha particles, fission fragments, and nonrelativistic heavy nuclei ICRP Publication 60 recommends wy=5. WR 1 5 10 20 10 5 20 Table 14.2 Tissue Weighting Factors, WT Tissue or Organ Gonads Bone marrow (red) Colon Lung Stomach Bladder Breast Liver Esophagus Thyroid Skin Bone surface Remainder* WT 0.20 0.12 0.12 0.12 0.12 0.05 0.05 0.05 0.05 0.05 0.01 0.01 0.05 * Note: The data refer to a reference population of equal numbers of both sexes and a wide range of ages. In the definition of effective dose, they apply to workers, to the whole population, and to either sex. The wr are based on rounded values of the organ's contribution to the total detriment. Table 14.1 Radiation Weighting Factors, wg, from NCRP Report No. 116 Radiation X and y rays, electrons, positrons, and muons Neutrons, energy <10 keV 10 keV to 100 keV >100 keV to 2 MeV >2 MeV to 20 MeV >20 MeV Protons, other than recoil protons and energy >2 MeV Alpha particles, fission fragments, and nonrelativistic heavy nuclei ICRP Publication 60 recommends wy=5. WR 1 5 10 20 10 5 20 Table 14.2 Tissue Weighting Factors, WT Tissue or Organ Gonads Bone marrow (red) Colon Lung Stomach Bladder Breast Liver Esophagus Thyroid Skin Bone surface Remainder* WT 0.20 0.12 0.12 0.12 0.12 0.05 0.05 0.05 0.05 0.05 0.01 0.01 0.05 * Note: The data refer to a reference population of equal numbers of both sexes and a wide range of ages. In the definition of effective dose, they apply to workers, to the whole population, and to either sex. The wr are based on rounded values of the organ's contribution to the total detriment.

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