Homemade MCA

This area is for discussions involving any fusion related radiation metrology issues. Neutrons are the key signature of fusion, but other radiations are of interest to the amateur fusioneer as well.
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Rapp Instruments
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Homemade MCA

Post by Rapp Instruments » Fri Apr 10, 2009 11:24 am

Hi,
I should like to show my homemade mca based on a PIC 16F84 processor. I have tested it with a also homemade semiconductor counter. The counter is made by removing the window of a simple BPX 61 photodiode. Counter and mca works well with a americium alpha source from a smoke detector and with a old radium loaded clock dial.
For neutron detection I try to use a scintillation counter with the mca. Has anyone tried to use a liquid scintillator with p-therphenyl and some boron compound. It should be easy to use some big volume scintillator for high sensibility

Thomas
Attachments
sectrum.jpg
sectrum.jpg (31.39 KiB) Viewed 2191 times
platine.jpg
platine.jpg (158.44 KiB) Viewed 2191 times
diode.jpg
diode.jpg (110.31 KiB) Viewed 2191 times

captn
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Re: Homemade MCA

Post by captn » Fri Apr 10, 2009 6:43 pm

Looks good!

Is there a website where we can look at the schematics and software?


Neil

DaveC
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Re: Homemade MCA

Post by DaveC » Fri Apr 10, 2009 9:53 pm

Nice work, Thomas.

I'll be interested in how your efforts with the liquid scintillator go.

The sensitivity of a Photo-diode as a particle detector can be affected by the biasing. What bias, do you use?


Dave Cooper

Rapp Instruments
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Re: Homemade MCA

Post by Rapp Instruments » Fri Apr 10, 2009 10:56 pm

Hi Neil,
I have attached schematics and program in the file section.
Hi Dave
the bias of the photo diode was 12 V

Thomas

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Carl Willis
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Re: Homemade MCA

Post by Carl Willis » Fri Apr 10, 2009 11:55 pm

Hi Thomas,

Looks like an interesting and original project.

I, for one, cannot read the schematic page in your PDF. It may be a problem with my computer.

In this day, MCAs are unnecessarily expensive products from nuclear electronics manufacturers and it would be nice to homebrew a reliable replacement. Thanks for posting this.

-Carl
Carl Willis
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TEL: +1-505-412-3277

Q
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Re: Homemade MCA

Post by Q » Sat Apr 11, 2009 2:04 am

carl, i can't open the files either. of course i'm using a 10 yr old computer... that may be part of it.
anyway, this is a fascinating project! quite impressive! i hope to see more of it in the future.

Q

hjerald1
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Re: Homemade MCA

Post by hjerald1 » Sat Apr 11, 2009 3:20 am

Save the PDFs to your desktop, then open....worked for me.
Better freshen up on your German .
Jerry

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Re: Homemade MCA

Post by Rapp Instruments » Sat Apr 11, 2009 5:42 am

Hi,
like Jerry told one have to download to open, I don`t know why.
I have used the old 16F84 processor which has nearly no internal ram and only 13 port pins. So I had to use a shiftregister to address an external ram and the adc. It's not a very smart solution. If I would rebuild the device nowadays I would use the same analog circuit but an Atmel processor, maybe ATMEGA32 with internal ram and internal adc.

Thomas

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