For my holidays I thought I'd build a nice PIC radiation detector.  I've researched the web and asked around, and have found two non-Geiger circuits that look promising.  Both involve a diode of some sort for a detector, followed by a FET-style opamp, followed by an audio or comparator stage for final output processing.

My question involves the diode detector:  One seems to call for a 'large-area photodiode', something that I don't offhand have in the junkpile, and the other for what looks like a high-voltage automotive diode 1n3191.  Can anyone tell me why an automotive diode would work for this, OR wheter something fairly common might work?  I have a no-brand small-area photodiode with a glass lens available.


here is the link to one of the circuits:

http://members.tripod.com/xexorz/schematics/dosage.html

Any advice would be appreciated.

Alice


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