MR> Because alphas can be blocked only by a sheet of paper, I must have a MR> close access directly to the diode. I've seen the OSRAM BPX 61 (a MR> silicon PIN photodiode) seems to be quite similar (from the package) to MR> the photodiodes in the article.
MR> I have to order it by mail so has anyone worked with this diode and can MR> tell me whether it has a glass lense that I can cut away or is the whole MR> space covered with a plastic substance (epoxy). An alternative diode for MR> me seems to be the BPW 21 (lense or plastic?). The osram datasheet says MR> nothing to this aspect (but who wants to cut a diode in pieces?) MR> Regards MR> Markus "thorium alphas" will travel about 3-8cm in air, according to their energies 3.954MeV (Th232) 5.34031MeV (Th228) 5.68542MeV (Ra224) 6.28813MeV (Rn220) 7.800MeV (At216) 10.554MeV (Po212) 6.05/6.08MeV (Bi212) If you don't detect any signal with your diode and do not have any other ability to test your Gl�strumpf, the error is not neccessarily in the circuit: there are modern cerium based incandescent mantles around which will not give you any significant amount of alpha radiation. BPW21 and BPX61 will both do the job. There is no epoxy filling inside the can, but the distance between the lens/window and the chip appears to be shorter than in the old ones from the article - it might be more difficult to remove the lens without damaging the thin front side bonding wire. Uwe. -- Mit freundlichen Gr�ssen Uwe Zimmermann mailto:[EMAIL PROTECTED] -- Author: Uwe Zimmermann INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
