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## Homework Statement

simulation of bersiv function of NaI detector it's in cylinder of water with volumetric source of Potassium40 (90% beta 1.31 mev & 10% gamma 1.504 mev )

how candefin define electron and gamma Volumetric source in mcnpx (6) ?

https://en.wikipedia.org/wiki/Potassium-40#/media/File:Potassium-40-decay-scheme.svg

## Homework Equations

cylinder rad= 220 cm & high= 190 cm

detc rad= 6 cm & high= 8

## The Attempt at a Solution

this is my solution:

NaI dect in wather source

1 1 -3.667 -4 5 -1 imp:p=1

2 2 -0.998 -3 6 -2 #1 imp:p=1

3 0 -7 #1 #2 imp:p=1

4 0 7 imp:p=0

1 cz 6

2 cz 220

3 pz 95

4 pz 4

5 pz -4

6 pz -95

7 so 250

mode p

m1 11023 0.4999 53127 0.5001

m2 1001 0.666657 8016 0.333343

sdef pos=0 0 0 rad=d1 axs=0 0 1 ext=d2 $ par=??? gamma and beta

cell=1

si1 0 2

sp1 0 1

si2 -4 4

sp2 0 1

f8:p 1

e8 0.01 2998i 3

nps 100000