a. Calculate the average microscopic capture thermal cross section (σa) for Pu-239 at a neutron temperature of 353°K. b. Repeat Part (a) for the Pu-239 fission cross section.
We have standard values of cross-section at T=20 C=293K
We can use those values to find thermal cross section at any other time by using formula
where T0=293 K and is value of thermal cross section at that 293 K
T is the temperature at which we want to find
In our case T=353 K
Hence above eqn becomes
Now we have standard values of at 293k For Pu-239
=capture cross section for Pu-239 =269 Barn
Fission cross section at 293K for Pu-239 is 748 barn
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