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4hv.org :: Forums :: High Voltage
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Measuring pulsed x-rays??

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PanosB_GR
Fri Apr 24 2009, 10:25AM Print
PanosB_GR Registered Member #1680 Joined: Fri Sept 05 2008, 04:19PM
Location: Greece
Posts: 43
Say you want to measure pulsed x-rays with sub-microsecond duration.

I have the feeling that this is quite a short period of time to use standard ionization chamber instruments.

Would a sum of pulses, imprinted on normal x-ray paper be a good solution?
I was thinking of using x-ray paper, exposing it to lets say 10 or 100 flashes (or whatever is needed),
and comparing its shaded areas to a result of a normal radiograph procedure
(i.e. a chest x-ray image, where the dosage is known).
Do you reckon this is going to work?

And by the way, are there any integrating instruments that are suitable for short pulses?
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Proud Mary
Fri Apr 24 2009, 10:33AM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
PanosB_GR wrote ...

And by the way, are there any integrating instruments that are suitable for short pulses?

Ionization chamber dosimeters are integrating instruments, and are the classic method of making such measurements, though PIN diode detectors capable of counting individual X-ray photons are also available now.
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PanosB_GR
Fri Apr 24 2009, 10:47AM
PanosB_GR Registered Member #1680 Joined: Fri Sept 05 2008, 04:19PM
Location: Greece
Posts: 43
I am mainly concerned about the time required for ionizing events inside the dosimeters, which, to my knowledge, is in the order of few microseconds.

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Proud Mary
Fri Apr 24 2009, 12:51PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Perhaps you should get a book on basic X-ray dosimetry, Panos, and then come back with questions when you've done that. smile
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PanosB_GR
Fri Apr 24 2009, 01:07PM
PanosB_GR Registered Member #1680 Joined: Fri Sept 05 2008, 04:19PM
Location: Greece
Posts: 43
fair enough cheesey

any suggestions?
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likewhat
Fri Apr 24 2009, 03:00PM
likewhat Account deactivated by user request on 6/11/2009.
Registered Member #1071 Joined: Fri Oct 19 2007, 02:13AM
Location:
Posts: 44
photodiodes are always the easiest

Link2

they cost up to $700 but S5668-421 is $65. Maybe you could just buy a small piece of fast scintillator and make your own though.
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Proud Mary
Fri Apr 24 2009, 04:37PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Panos, your question can't really be answered until you specify the range of photon energy to be detected, as this will produce a range of different answers. smile
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PanosB_GR
Fri Apr 24 2009, 07:09PM
PanosB_GR Registered Member #1680 Joined: Fri Sept 05 2008, 04:19PM
Location: Greece
Posts: 43
range should be up to around 300keV... i'm taking a look onto these photodides right now :)

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Proud Mary
Fri Apr 24 2009, 07:57PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
It's the lower end of the spectrum that becomes more and more difficult to measure as the wavelength increases.
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