# NaI detector in water source -- gamma & beta

1. Jun 28, 2016

### ali khotbesara

1. The problem statement, all variables and given/known data
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
2. Relevant equations
cylinder rad= 220 cm & high= 190 cm
detc rad= 6 cm & high= 8

3. 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

2. Jul 4, 2016

### Greg Bernhardt

Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?

3. Jul 6, 2016

### Staff: Mentor

What does mcnpx (6) mean?
What is "detc"?
The information in the table below is not clear. Also, what is "dect"? Above you have "detc". I don't understand either of these. Are they short for "detector"?
The table below is meaningless, as far as I can tell. What do "cz", "pz", and "so" mean? And what is the significance of the numbers?
I don't know how you can expect anyone to help here, with tables of numbers with no explanation for what the numbers mean.