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

[Jared Strydhorst]

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

Laboratoire Imagerie Moléculaire In Vivo (IMIV)
UMR 1023 Inserm/CEA/Université Paris Sud - ERL 9218 CNRS
CEA/I2BM/Service Hospitalier Frédéric Joliot
4, place du Général Leclerc
91401 ORSAY Cedex
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