<font>Hello Gate users,<br><br><br><br>Here are some advices on the issue of using "forbid" command to generate cold area in phantom.<br><br>The forbid command is working properly for both single cold areas and multiple cold areas.<br>
<br>Here are some suggestions: <br><br><b>1</b> 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 <br>
be the daughter of the water phantom, not the daughter of the world.<br><br><b>2</b> initializing step should run after defining the cold area, before defining the source.<br><br><b>3</b> if forbid success, there should be two lines indicated by terminal </font>(if you debug your codes one line by one line in the terminal)<br>
<br>"Confirming activity forbidden in volume 'xxxx'<br>Activity forbidden in volume 'xxx' confirmed"<br><br><b>4</b> The name of the cold area should longer than 5 characters.<br><br><br>Special thanks for Gate users <span style="background-color:white">Yilong liu, </span> <font color="black" face="Tahoma"><span style="font-size:10pt" dir="ltr">Taku and </span></font><font face="Verdana"><span style="font-size:10pt"><font color="black" face="Tahoma"><span dir="ltr">Xuexiang for their important advices and suggestions.<br>
<br><br>Cheers,<br>Kaiyang Li<br></span></font></span></font><br><br><br><font face="Verdana"><span style="font-size:10pt"></span></font>