[Gate-users] Drilling a Hole on the Phantom

[Omar Bin Sheetan]

Hello Xinjie,

As long as there’s no overlapping and every daughter volume is contained within its mother volume, I think things should be fine. In my understanding, the daughters of  a volume should not intersect (overlap) with each other.

In your case, is there an overlap? Have you chosen the right mother volume for your air phantom?

Regards

Omar


On Jul 31, 2020, at 3:37 PM, Xinjie Cao <xinjie.cao at stonybrook.edu> wrote:


Dear all,

I used to implement the hole drilling on a phantom as followed,
```
/gate/world/daughters/name phantom1
/gate/world/daughters/insert cylinder
/gate/phantom1/placement/setTranslation           0.0 0.0 0.0 mm
/gate/phantom1/geometry/setRmax                   100. mm
/gate/phantom1/geometry/setHeight                 500 mm
/gate/phantom1/setMaterial                              Polyethylene
#/gate/phantom/vis/forceWireframe
#/gate/phantom/vis/setColor green
/gate/phantom1/attachPhantomSD

/gate/world/daughters/name phantom2
/gate/world/daughters/insert cylinder
/gate/phantom2/placement/setTranslation           0.0 -25.0 0.0 mm
/gate/phantom2/geometry/setRmax                   3.0 mm
/gate/phantom2/geometry/setHeight                 500 mm
/gate/phantom2/setMaterial                               Air
#/gate/phantom/vis/forceWireframe
#/gate/phantom/vis/setColor green
/gate/phantom2/attachPhantomSD
```
But I have been always thinking whether the air phantom I insert works as the drilled hole? Or does it work as a cylinder mixed with polyethylene and air?
Another way to say is whether a new phantom placed within the other phantom volume will take the place of the original material or mix with it?
Any answer would be highly appreciated! Thanks!

Best,
Xinjie
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