Mail Archives: geda-user/2017/07/04/21:23:40
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On Jul 4, 2017, at 2:53 PM, Stephan B=F6ttcher <geda AT psjt DOT org> wrote:
>>> No, sorry. What I have is for the RPi1. I hope to launch it on a
>>> balloon into the stratosphere next week:
>>>=20
>>> http://www.ieap.uni-kiel.de/et/people/stephan/rpirena/
I used to do that stuff a long time ago. Last time was 1975, with a ton =
of gondola carrying NaI/CsI =93phoswich=94 scintillation detectors for =
hard x-rays. We sent it up with a 1.5 million cubic meter =93zero =
pressure=94 helium balloon.
> That slope can be the tail of the noise or indeed some x-ray
> background. It looks like the tail of the noise to me.
Might also have some poorly collected charge. The outer edges of these =
diodes are usually not depleted: you=92ll collect some charge from a =
track by diffusion, but you=92ll lose some of it, too.
> The light can be measured with the same kind of silicon
> photodiodes. The calibration is not as easy, since the light yield
> depends on temperature and doping of the scintillator, on the shaping
> time of the electronicsm and the resulting balistic deficit, which is
> the light that comes to late to be integrated by the shapers. The =
time
> profile of the light emission depends on temperature as well.
In the old days we used photomultipliers. At least with diodes you don=92t=
have to worry about magnetic fields changing the gain!
John Doty Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com
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