Oh, they have the resolution but not the sensitivity. I don't think it will be sensitive enough for edx with nA range e-beam currents. There are pin diode detectors for gamma spectroscopy but they are no where near as sensitive as HPGe, SiLi or other sensors they are trying to replace.
-Jerry > On May 21, 2015, at 11:32 AM, Nathan McCorkle <[email protected]> wrote: > >> On Thu, May 21, 2015 at 10:27 AM, Jerry Biehler <[email protected]> >> wrote: >> I dont think you will get far with a PIN diode. > > I had this sitting around from a previous email on this subject: > """ > Pocket Photodiode Geiger Counter > http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_2170812_-1 > > > Specifically check out figure 6: > http://www.ifm.umich.mx/~villasen/Com_Vol/RAMIREZ_PINdidodes.pdf > > > From the following paper: > "Photodiodes with small active areas present a resolution of 1.2 - 2.0 > keV at room temperature (Aoki and Koyama, 1989; Yamamoto et al., 1989; > Ahmad et al., 1990; Gramsch et al., 1992) measured by the peak's full > width at half maximum (FWHM). This resolution can be compared to that > of cooled Si(L1) detectors coupled to preamplifiers with cooled FET, > which is in the range 0.6 - 0.8 keV (Ahmad and Wagner, 1979). > Therefore, PIN photodiodes become competitive even for high resolution > photon spectroscopy in the keV energy region." > > "This paper presents some new measurements of discrete and continuous > photon spectra, in the energy range 15 - 160 keV, with a photodiode at > room temperature" > > Measurements of discrete and continuous X-ray spectra with a > photodiode at room temperature > http://diyhpl.us/~nmz787/pdf/Measurements_of_discrete_and_continuous_X-ray_spectra_with_a_photodiode_at_room_temperature.pdf > > """ > > -- > -Nathan > _______________________________________________ > dorkbotpdx-blabber mailing list > [email protected] > http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber _______________________________________________ dorkbotpdx-blabber mailing list [email protected] http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber
