Given the following hypothetical information on individual absorbed dose and the

Question

Given the following hypothetical information on individual absorbed dose and the nature of the radiation sources involved (assume only the primary mode of radiation emission for each radionuclide indicated), also assume that total dose will be received by a radiation worker within a year. Please answer the following questions (assuming ICRP 103 methods and guidance): (7-a) estimate the equivalent doses for each organ shown, (7-b) estimate the effective doses for each organ (if applicable), (7-c) what is the total effective dose and the possible lifetime risk for this person? (7-d) Is this person in compliance with the regulations (assume CRP 103 recommendations and also current NRC 10 CFR 20 regulations, respectively. You don't have to recalculate the 10 CFR 20 dose based on old weighting factors)? (7-e) What if the newly drafted NCRP limits on the lens of eye are considered is in compliance? And (7-f) state the possible measures to achieve ALARA in the workplace. Assume only the primary mode of radiation emission for the radionuclide specified. Assume the entire body is uniformly irradiated.

Explanation / Answer

Organ

Effective Dose (mSv)

10xo.o1= 0.1

7a) estimative equivalent dose of each organ :

Dose equivalent = Radiation absorbed dose x Q (quality factor)

b) effective dose equivalent = Dose equivalent x W (weighting factor )

c) Total effective dose equivalent = sum of effective dose equivalent and committed effective dose equivalent

d) person in compliance NRC 10 and CFR 20 regulations is radiation protection programms, occupational dose limit, radiation dose limit for individual members of public

e) new drafted NPRC lense of eye is dose limits to eyes

Organ

Absorbed Dose (mGy) Radio nuclide of interest Equivalent Dose (mSv)

Effective Dose (mSv)

Stomach 10 Sr 90 10x 0.4 = 0.4

10xo.o1= 0.1

Breast 15 Co 60 15x 1= 15 15 x 0.12= 1.8 Lens of Eye 50 1 Mev 50x 0.01= 05 50x0.01= 0.5 Lungs 0.5 Pu - 239 0.5x 0.4= 2.0 10x 0.12= 1,2 Gonads 10 Cs-137 10x 0.1= 0.1 10x0.08= 0.8 Hands 80 Sr90 80x0.4= 3.2 80x 0.1= 0.8 Thyroids 20 I-131 20x0.4 = 0.8 20x0.04=0.8 Bone surface 1 Ra-226 1x0.1=0.1 1x 0.01= 0.01 Bladder 10 Sr90 10x0.4=0.4 10x0.04= 0.4 Whole Body 10 epithermal neutron 10x0.1= 0.1 10x 0/04= 0.4

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