[Gate-users] Simulated energy spectrum not same as actual energy spectrum

[Adolf Nordin]

Hi

I've hit 2 walls, bit want to sort the first.

I have a simple geometry for a SPECT system:

SPECTHEAD
Lead shielding
Al cover under the crystal
Crystal
Back cover
No collimator (doing intrinsic tests).

Source

The simulation runs fine.

However, when I compare the energy spectrum from the simulation with an actual energy spectrum from the camera, I get very little low energy counts.

So I cannot say that the simulation is a true reflection of the actual system.

Is this a known issue, or am I missing something.

Thanks.
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