|Message: Re: Kr-85 gas in Geant 4||Not Logged In (login)|
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Geant4 internal DB (based on NIST data) includes G4_Kr, which is described as a natural combination of isotopes. Kr85 has very low abundance and is not part of G4_Kr.
If you need Kr85 isotope, the only possibility is to create G4Material by hand and G4Element Kr by hand. For this G4Element you have to define abundances of each isotope of your interest.