The Student Room Group
Reply 1
Bit of Google never harms anyone. I searched "radionuclides half life beta", and got:

http://www.safety.vanderbilt.edu/resources/radmanual/radiation_manual_appendixB.pdf
The closest one I know is Strontium-90 (Sr-90), it has a half-life of 28.8 years and it emits almost pure beta radiation
Reply 3
Ac227 goes thru Beta minus 98.6% of the time with a combined half life of 21.77 Years. It also goes thru Alpha decay.

Pb 210 goes through Beta minus with a half life of 22.3 Years.

These are both naturally occuring nuclieons as they are both in decay chains.
Reply 4
Thanks alot guys! U have solved my probs! :smile:

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