Re: Replacement for BPDP-30 / HP5082-4203

[Markus Rohe]

Hello!

Thank you all for so many inspiring answers! For my project I'm insterested in detecting alpha particles e.g. from a thorium subtsrate ('Gl�hstrumpf' = weaved substrate covered with thorium and other metal oxides to make gas lamps glow brighter). Substrate and diode will be kept completely in the dark and I'm
interested in the time intervalls between the decay impulses to extract
true random values from it.

Because alphas can be blocked only by a sheet of paper, I must have a close access directly to the diode. I've seen the OSRAM BPX 61 (a silicon PIN photodiode) seems to be quite similar (from the package) to the photodiodes in the article.

I have to order it by mail so has anyone worked with this diode and can tell me whether it has a glass lense that I can cut away or is the whole space covered with a plastic substance (epoxy). An alternative diode for me seems to be the BPW 21 (lense or plastic?). The osram datasheet says nothing to this aspect (but who wants to cut a diode in pieces?)

Regards
Markus

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Author: Markus Rohe
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