1. Dec 31, 2017

1. The problem statement, all variables and given/known data

I have attached the question below.

2. Relevant equations

I'm not sure how to answer the question.

3. The attempt at a solution

I started by calculating the specific dose rates for each isotope, but I cannot get any data for 90Sr using: http://www.nucleide.org/Laraweb/index.php

This is what I have so far.

For 1000 Bq of 137Cs, 850 photons per second are emitted with an energy of 662 keV. This equals a specific dose rate of 84 μSv/h/GBq at one meter. For 1 μCi this is 84 μSv/h/GBq x 10-6 x 37 GBq = 3108 μSv/h.

For 1000 Bq of 131I, 810 photons per second are emitted with an energy of 364 keV. This equals a specific dose rate of 0.4 μSv/h/GBq at one meter. For 2 μCi this is 0.4 μSv/h/GBq x 10-6 x (2X37 GBq) = 2.96X105 μSv/h.

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2. Dec 31, 2017

### PSRB191921

There is confusion between external dose (your calculation) and internal dose ( your problem)

3. Jan 3, 2018

Thanks for the reply. Could you give me some tips on how to answer this question please?

4. Jan 4, 2018

### PSRB191921

Hi,
For that you must use "Dose coefficients for intakes of radionuclide"
But if you have never heard of it, it may be complicated

5. Jan 4, 2018

I would like your help if possible. I haven't covered this material.

I have been recommended the following book, do you know if it will cover this material?

Radiation Detection and Measurement (3rd Edition) Glenn F Knoll (Wiley)

Thanks

6. Jan 4, 2018

7. Jan 8, 2018