Uncovering Half-Life Data for Odd Isotopes: A Search for Fission Products

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The discussion revolves around the difficulty in finding half-life data for seven specific fission product isotopes listed in the Sigma database at Brookhaven. Despite attempts to locate this information through various databases and resources, including NEA and Wikipedia, the user has had limited success. Some participants suggest checking additional databases, including a specific ENDF/B-VII.1 decay sublibrary, but the user clarifies they are looking for half-lives of the first excited states, denoted as m1. There is acknowledgment that while these isotopes are not rare, their short half-lives may not pose significant issues in waste streams. The search for accurate half-life data for the first excited states continues.
Moniz_not_Ernie
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The Sigma database at Brookhaven lists seven isotopes as fission products for which I can't find half-life data. I've tried nea6287-JEFF-20-1, the NuDat_2 web site, Nuclear Wallet Cards and Wikipedia. Anybody have any other ideas?
The isotopes are
74-As-m1
85-Se-m1
86-Br-m1
109-Ru-m1
109-Rh-m1
143-Xe-m1
162-Tb-m1
 
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Ooh, so close. Got the first one on the list, then went 0 for 6.

Thanks.
 
You may want to check out these databases. http://www.nndc.bnl.gov/endf/b7.1/lists/dec-ENDF-B-VII.1.endf.listis a list of all the isotopes in the ENDF/B-VII.1 decay sublibrary. A quick look shows it has at least some of the isotopes. It doesn't say anything about meta-stable states for the ones I looked at so hopefully you mean m1 is the ground state instead of first excited state.
 
Sorry. I do mean the first excited state. None of the isotopes on my list show up on the list you provided.
These aren't exactly rare fission products. The max yield for 109-Ru-m1 is over 1%, albeit for 142-Am-m1 as the fuel. For 85-Se-m1 it's ~0.5% for 233-U and 235-U. I expect they aren't much of a problem in the waste stream because of short half-lives. I'll mention them as a caveat in my assumptions.

Thanks, though.
 
Moniz_not_Ernie said:
The Sigma database at Brookhaven lists seven isotopes as fission products for which I can't find half-life data. I've tried nea6287-JEFF-20-1, the NuDat_2 web site, Nuclear Wallet Cards and Wikipedia. Anybody have any other ideas?
The isotopes are
74-As-m1
85-Se-m1
86-Br-m1
109-Ru-m1
109-Rh-m1
143-Xe-m1
162-Tb-m1
http://atom.kaeri.re.kr/ton/
Did you look here? I got the results for all (I am not sure what you mean by m1).
I got for the particular isotopes: As 17.77 days, Se 31.7 s, Br 55.1 s, Ru 34.5 s, Rh 80 s, Xe 0.30 s, Tb 7.60 min.
 
To mathman, re http://atom.kaeri.re.kr/ton/
(This forum doesn't indent enough!)
Yes I visited the Korean site, twice. On my second visit I followed one reference URL back to a UK paper on PDF at Brookhaven. A bit roundabout, but very worldly. The PDF topic is not really half-lives, but they use them to describe the excited states. The PDF doesn't label them m1, m2, etc. I got the 74-As-m1 half-life from the Korean site, then 109-Ru-m1 from the PDF. Four more to go.
The numbers you gave above are for the ground state. I'm looking for the first excited state (-m1).
 

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