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New photodiode for Alfa

Ideen, Hinweise, Erfahrungen beim Messen von Radioaktivität

Postby jakket » Thu Feb 02, 2012 12:00 am


sorry about my german...
I did some testing with another Photodiode SLCD-61N1 (not PIN) from Silonex I found @ Farnell for next to nothing. It is a 5x2,5 mm. bare chip that is passivated and can be soldered, but don't try this after a heavy night in the pub )
The thing is... it works extremely well for Alfa emitters, an Americum241 from a fire detector @ 2cm from the diode gives around 2800+ tics per minute. I did change the gate resistance to ground to 10Mohm i.o. 20.
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Postby kld » Mon Mar 12, 2012 12:00 am


Farnell also has bigger diodes from SILONEX, like the SLCD-61N5.

I wonder what sensitivity this part may give.

Also available with soldered wires (SLSD-71N500).

But maybe that it doesn't work at all with the bigger
diodes, because of their high dark current.
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Postby burkhard kainka » Tue Mar 13, 2012 12:00 am

Recently I also used very large diodes. They were very good for alpha detection. But they had more noise, so it was difficult to find gamma and beta signals.

My results can be seen here:
burkhard kainka
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