Solving the Question: Calculating Dose Rate for 90Sr

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Homework Help Overview

The discussion revolves around calculating the dose rate for the radionuclide 90Sr, with participants exploring the differences between external and internal dose calculations. The subject area includes radiation physics and dose assessment related to radioactive isotopes.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Participants discuss attempts to calculate specific dose rates for various isotopes, including 137Cs and 131I, while expressing confusion about the application to 90Sr. Questions arise regarding the distinction between external and internal dose calculations, and some participants seek guidance on relevant resources and methodologies.

Discussion Status

There is ongoing exploration of the topic, with some participants providing references to literature and resources that may assist in understanding the calculations. However, there is no explicit consensus on the approach to take for 90Sr, and multiple interpretations of the problem are being considered.

Contextual Notes

Participants mention a lack of familiarity with the material and express uncertainty about the necessary calculations and resources. There is also a reference to specific dose coefficients for radionuclide intake, which may be relevant to the discussion.

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Homework Statement



I have attached the question below.

Homework Equations



I'm not sure how to answer the question.

The Attempt at a Solution


[/B]
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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There is confusion between external dose (your calculation) and internal dose ( your problem)
 
Thanks for the reply. Could you give me some tips on how to answer this question please?
PSRB191921 said:
There is confusion between external dose (your calculation) and internal dose ( your problem)
 
Hi,
For that you must use "Dose coefficients for intakes of radionuclide"
But if you have never heard of it, it may be complicated
 
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

PSRB191921 said:
Hi,
For that you must use "Dose coefficients for intakes of radionuclide"
But if you have never heard of it, it may be complicated
 
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.

KOopznc.jpg
 

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