Solving the Question: Calculating Dose Rate for 90Sr

[adamworth]

Homework Statement

I have attached the question below.

Homework Equations

I'm not sure how to answer the question.

The Attempt at a Solution

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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.

 

[PSRB191921]

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

 

[adamworth]

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

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

 

[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

 

[adamworth]

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

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

 

[PSRB191921]

Hi, "the knoll" is an excellent book but it does not treat your problem. It treats radiation mesurement.
For internal dose you can read the ICRP 119 : http://www.icrp.org/docs/P 119 JAIC...Coefficients based on ICRP Publication 60.pdf

 

[adamworth]

I'm trying to finish an assignment which is to help me in my exam, but I am very stuck on three questions.

If I find out how to answer question 7, will I be able to answer 8 and 9? I really need a good resource.

Quesitons attached below.