[Gate-users] Bug when using RadioactiveDecay in GATE 7.1

[Pietrzyk, Uwe]

Hi Jared,

let me briefly ask what the detector looked like?
Since there are emission lines of 202 and 88 keV, the 290 keV
is likely to be a "summation peak”.

I have checked the RadioactiveDecay in 7.1 for our EduGATE
examples and did not find anything wrong. So I am a little bit
puzzled by the statements in your eMail.

Kind regards,

Uwe Pietrzyk

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On 15 Sep 2015, at 11:05, Jared Strydhorst <jared.strydhorst at gmail.com<mailto:jared.strydhorst at gmail.com>> wrote:

If you're using RadioactiveDecay with GATE 7.1, there is a bug in Geant4 v10.1.1 that causes the emissions from the nuclear de-excitation to be simulated incorrectly. For example, I've found that after Lu-176 decays to Hf-176, it emits a 307 keV gamma, correctly, but then goes to the ground state by emitting an unphysical 290 keV gamma, instead of a 202 keV followed by a 88 keV gamma, or the competing conversion electrons. I don't know how other isotopes are affected, though it seems from the relevant Geant4 forum that the problem isn't specific to Hf de-excitation.

The bug has been fixed in G4 v10.2 (still in beta), and doesn't seem to be present in earlier versions, so if you use GATE 7.0 or earlier it shouldn't affect you.

Jared STRYDHORST

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