I believe you are trying to get Bq/g of S-33. I don't have a S-32 case, but here is an example of a NaCl case where I am looking for the Bq/g of Na-24 using an FM tally. To get Bq/g of S-33, multiple the reaction rate for S-32(n, gamma) by the decay constant and divide by the density of the sulfur pellet.

C

C Summary of MatMCNP Calculations:

C

C Isotope Number Fraction Weight Fraction Atoms/b-cm

C Na-23 0.5000000 0.3933741 0.0223605

C Cl-35 0.3788500 0.4533669 0.0169425

C Cl-37 0.1211500 0.1532590 0.0054179

C

C The total compound atom density (atom/b-cm): 0.04472100

C

M1 11023.62c 0.5000000 17035.62c 0.3788500 17037.62c 0.1211500

C

M1600 11023.62c 1.00000

C

C To get Bq/g of Na-24, multiple by the decay constant and divide

C by the density.

C

C lambda = 1.296466841e-05 1/s

C rho = 0.971 g/cc

C

FC14 Na-24 Activity (Bq/g/source-n)

F14:N 100

FM14 3.39607553e-07 1600 102

C

C

If you search github.com, you can find an open source version of MatMCNP to do some of the material calculations.

Thanks.