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Electronics Forum / Equipment / August 2007X-ray detector equipment with semiconductor sensor
I would like to know if someone have a example of a circuits that have a commercial photodiode or phototransistor how sensors ? Send me a link or achive with applications notes ! I am trying to development a small x-ray dose meter for x-ray diagnostic ! Thanks for help ! > I would like to know if someone have a example of a circuits that have a > commercial photodiode or phototransistor how sensors ? Send me a link or > achive with applications notes ! > I am trying to development a small x-ray dose meter for x-ray diagnostic ! > Thanks for help ! This circuit claims to be able to detect 60keV photons: http://pdfserv.maxim-ic.com/en/an/AN2236.pdf I think that it may not be suitable for detecting high dose rates like you would find with an X-ray tube. Chris >>I would like to know if someone have a example of a circuits that have a >>commercial photodiode or phototransistor how sensors ? Send me a link or [quoted text clipped - 10 lines] > > Chris Recently, i had some X-rays taken, 50 KEV and the imaging plate was a semiconductor (array?) with very good resolution - as good as film. >>>I would like to know if someone have a example of a circuits that >>>have a commercial photodiode or phototransistor how sensors ? Send me [quoted text clipped - 13 lines] > a > semiconductor (array?) with very good resolution - as good as film. it was probably coated with a phosphor,and the silicon just reads the light emitted from the phosphor when the Xrays strike it.  SignatureJim Yanik jyanik at kua.net Le Wed, 22 Aug 2007 13:24:42 +0000, Jim Yanik a écrit: >>>>I would like to know if someone have a example of a circuits that have >>>>a commercial photodiode or phototransistor how sensors ? Send me a [quoted text clipped - 15 lines] > it was probably coated with a phosphor,and the silicon just reads the > light emitted from the phosphor when the Xrays strike it. Yup, except this almost surely isn't phosphor. I've done some interesting consulting for this product line http:// www.trixell.com/pdf/Pixium4600.pdf and they use cesium iodide because of its high conversion efficiency. SignatureThanks, Fred. > Le Wed, 22 Aug 2007 13:24:42 +0000, Jim Yanik a écrit: > [quoted text clipped - 22 lines] > www.trixell.com/pdf/Pixium4600.pdf and they use cesium iodide because of > its high conversion efficiency. Well,that would BE one kind of phosphor. I did say "a phosphor". 8-) Just an emissive coating,usually made from rare earth elements,like TV sets use.You would select for best wavelength that the semiconductor is most sensitive to,probably shortwave IR) SignatureJim Yanik jyanik at kua.net |
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