pin photo diode detection

Scintillation crystals, PMTs, voltage dividers etc...
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luuk
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Location: the Netherlands
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pin photo diode detection

Post by luuk » 26 May 2017, 07:13

Just for the fun of it I took an old bare Hamamatsu S1337-1010BR pin photo diode and did some test with three different sources, without a scintillation crystal.
The thickness of the diode is only 0.3mm so efficiency is very low but still there is something to detect, sources were in direct contact with the diode surface.
Measuring time a 1-3 minutes.



Luuk
Attachments
HPIM0150_resized.jpg
Cs-137 on bare 10x10mm diode_resized.jpg
Co-57 on 10x10mm diode_resized.jpg
Am-241 on bare 10x10mm diode_resized.jpg

stamasd
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Joined: 29 Oct 2017, 02:12
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Re: pin photo diode detection

Post by stamasd » 29 May 2018, 00:49

Interesting. I've been toying with the idea of trying some PIN photodiodes as detectors. Just lacking the time.
I've seen some papers online, not too many. Seems that these are reasonable to use only below 100keV or so, because of the small detector volume thus don't have enough stopping power for higher energy photons. But below that, especially the bigger photodiodes can make reasonable detectors if the signal amplifier is very carefully constructed. In one such paper they achieved a resolution of about 1.5keV for the americium peak. Maybe decent for XRF?
Real name: Silviu Tamasdan

luuk
Posts: 174
Joined: 01 May 2015, 21:00
Location: the Netherlands
Contact:

Re: pin photo diode detection

Post by luuk » 01 Jun 2018, 06:34

Hello Silviu,

I don’t think that it is possible to use a bare diode as detector for xrf , the efficiency of the diode is to small and if you want to do xrf the counter rate of the signal is very low therefore you will use an extreme long time to get an result then you will have stability problems.
Because diodes are very temperature depended, also it will be nearly impossible to get a good resolution on these low energies.
So in my opinion it will not work.
Luuk

stamasd
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Joined: 29 Oct 2017, 02:12
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Re: pin photo diode detection

Post by stamasd » 17 Jun 2018, 10:30

Thanks. It's always good to hear from experts, avoiding thus to waste one's time. :)
Real name: Silviu Tamasdan

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