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solpete

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- TL;DR Summary
- I need to calculate the Beta dose deposited in plastic. Source is Co-60 or Cs-137. The question is relevant for radiolysis/degradation of plastic materials in a repository.

I have plastic which contains large amounts of Co-60 and Cs-137. I have already calculated the integrated (50k years) deposited dose from the gamma radiation using Monte-Carlo methods (SCALE).

I am now interested in the contribution to deposited dose from the Beta emissions.

-I am assuming that all Beta is stopped in the plastic itself.

-For Co-60, the average Beta energy is about E=0,31*(1/3) Mev.

-The conversion factor from MeV to Joules is C=1.6e-13 J/MeV.

Would the instant contribution to deposited dose in Gy (J/kg) per second

E*C*I/m,

where I is the intensity in Bq and m is the mass?

Side note: Bremsstrahlung photons will also contribute to dose, but I have a feeling that this contribution is minor.

I am now interested in the contribution to deposited dose from the Beta emissions.

-I am assuming that all Beta is stopped in the plastic itself.

-For Co-60, the average Beta energy is about E=0,31*(1/3) Mev.

-The conversion factor from MeV to Joules is C=1.6e-13 J/MeV.

Would the instant contribution to deposited dose in Gy (J/kg) per second

__from Co-60 Beta__be:E*C*I/m,

where I is the intensity in Bq and m is the mass?

Side note: Bremsstrahlung photons will also contribute to dose, but I have a feeling that this contribution is minor.

**Peter, Phd**
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