[Gate-users] cold area and "forbid" usage in GATE

[kaiyang li]

Hello Gate users,



Here are some advices on the issue of using "forbid" command to generate
cold area in phantom.

The forbid command is working properly for both single cold areas and
multiple cold areas.

Here are some suggestions:

*1* cold area can not be overlapping with other volumes in the world (
source is not a volume, so cold area can overlap with source). If you want
to simulate a cold area in a water phantom. This cold area should
   be the daughter of the water phantom, not the daughter of the world.

*2* initializing step should run after defining the cold area, before
defining the source.

*3* if forbid success, there should be two lines indicated by terminal (if
you debug your codes one line by one line in the terminal)

"Confirming activity forbidden in volume 'xxxx'
Activity forbidden in volume 'xxx' confirmed"

*4* The name of the cold area should longer than 5 characters.


Special thanks for Gate users Yilong liu,  Taku and Xuexiang for their
important advices and suggestions.


Cheers,
Kaiyang Li
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