Radiation dose outside the lead hutch

Scoring
1

Dear Fluka experts,
I’ve simulated a 9e08 particle photon beam on a Cu target inside a hutch to measure the dose rate outside the lead shield wall. I’m trying to understand the indication of radiation just outside the hutch wall. How can I interpret this? Why have they stopped just outside the wall? Have I done something wrong in the INP file? Please help me to understand this result and fix any errors in the INP file. I’ve attached the Flair file and two images.

image
image925×536 92.6 KB

image
image919×553 102 KB

I14_OH_GB.flair (17.1 KB)

Thank you very much for your support and contribution to the FLUKA community.

Best wishes,
Sanjeev

1 Like
2

Hi @sfaruk
One bin of your USRBIN starts at Y=250 and extends to 260, and you are seeing data in that bin.
Try defining another USRBIN with Y=250.4 as Ymin (or adjust the bin size to have a clean bin outside the lead) to see what comes out.
-s

1 Like
3

Hi @sunil, I’ve changed the bin size, and it’s looking much better. Thanks for your help and quick reply.

Best wishes,
Sanjeev