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Whats the matter with beta radiation?

Posted: 25 Mar 2017, 21:00
by sgt_bear
Hello,

I'm really confused when it comes to the emitting of rays from isotopes.
Seems like the suppliers use all different explanations.

Eg.
If you look at the Co-60 ENSDF File (1500days half live) http://www.nndc.bnl.gov/chart/decaysear ... CO&unc=nds

It tells you that there are 99% beta at 95kev, and 99% gammas at 1173,1332 kev.

If you check suppliers for Co-60 it comes out as this:

Spectrum Techniques: Shows the same as ENSDF
United Nuclear: claims "gamma"
Imagesco: Says Gamma & Beta

In this Video (about 4:00 Min)
https://www.youtube.com/watch?v=TiNbxAo ... 4364453669
It can be seen that the disk must be only gamma, since the counts are compared to Cs-137 are very low.

So i don't get it. Can it be that i read the ENSDF File wrong? Or are the betas so weak that they get stuck in the disk itself?
But why does Na-22 emit the gammas then?

I'm asking this, because there are alot of other isotopes that appear the same (Co-57, Mn-54,Zn-65) some suppliers say "gamma" others say "gamma beta"

Maybe someone does understand this better than me... :(


Im currently looking for a gamma, beta, alpha source that only emit one type.

For beta i would pick 0.25uCi of Tl-204 (Sr-90 has a too long half life)
For alpha i would pick 50nCi of Po-210
And currently im looking at a 1uCi Co-60 Source, but if i would know if e.g Mn-54 is only gamma, i would pick Mn-54 over Co-60;