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Warning Decay incorrect in I-137, La-145, and Rb-93 

Forum: Hadronic Processes
Date: Feb 22, 07:27
From: Evan Rand <Evan Rand>

Hi G4Experts,

I've found the gamma-ray intensity from the radioactive decay of I-137, La-145, and Rb-93 is incorrect comparing to nuclear data.

For my application I was only looking at gammas > 2 MeV, but I found large discrepancies in I-137 and La-145, and a smaller discrepancy in Rb-93. The simulation was built using Geant4.10.03.p02, using data files G4RadioactiveDecay5.1.1 and G4PhotonEvaporation4.3.2. The simulated decays of I-137 and La-145 generated significantly more high-energy gamma-rays compared to the evaluated data [1,2], roughly 7 and 4 times more, respectively. And I found a 20% fewer high-energy gamma-rays compared to the evaluated data [3] for Rb-93. The radioactive decay and photoevaporation data files need to be fixed for these isotopes.

Cheers, Evan

[1] E. Browne, J. Tuli Nuclear data sheets for a = 137 Nucl. Data Sheets, 108 (10) (2007), pp. 2173-2318, 10.1016/j.nds.2007.09.002

[2] E. Browne, J. Tuli Nuclear data sheets for a&#8239;=&#8239;145 Nucl. Data Sheets, 110 (3) (2009), pp. 507-680, 10.1016/j.nds.2009.02.001

[3] C.M. Baglin Nuclear data sheets for a&#8239;=&#8239;93 Nucl. Data Sheets, 112 (5) (2011), pp. 1163-1389, 10.1016/j.nds.2011.04.001

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