Calibrate the energy

[Peter-1]

Hello,
I like to use a thorium sample to calibrate the energy in my program. Unfortunately, this only works up to 2614 keV. My question: is there still an isotope that can be used in even higher energy ranges?
regards
Peter

[luuk]

As far as I know this is the highest energy from standard/natural isotopes.
Luuk

[kotarak]

Another possibility is Co-56 (Half-life 77 days).
Not sure where you can get such source but it has an emission at 3253 keV.
http://www-eng.lbl.gov/~shuman/NEXT/MAT ... 3.5MeV.pdf

[Peter-1]

Thank you for the information. now i have also seen the law of decay in a large list.

Peter

[Go-Figure]

In case you find some let us know, anyway once you have the calibration right up to 2.6 MeV I don't know how much it can go off at 3.2 MeV.
Anyway, in my case I had never tested samples with peaks at such high energies so I would have never known.

Massimo