Greeting from Finnish Lapland!

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1 month 2 weeks ago - 1 month 2 weeks ago #6924 by Simomax
I have just found this document - The gamma counting handbook. It has many references to Wallac, but I think from the 80's or later. It's a long read so one for the weekend I think. It may shed some light on what is in your Wallac. It does mention a 'well' type detector. Not something I have heard of. It may be similar to an ion chamber, but one diagram shows it with a PMT (photomultiplier tube). It does look interesting even if it has no bearing on your Wallac.

https://ia802907.us.archive.org/3/items/manual_PerkinElmer_Wallac_1470_Wizard_1480_Wizard_3_Gamma_Counting_Handbook/PerkinElmer_Wallac_1470_Wizard_1480_Wizard_3_Gamma_Counting_Handbook.pdf
Last edit: 1 month 2 weeks ago by Simomax.

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1 month 2 weeks ago #6925 by OH8EFI
Hey! I took the Wallac apart on the day I got it and here's the internals. Very few of the components really return anything in google. The round iron core chamber has 6 wires going into it.
https://mega.nz/folder/7R1SSCqa#nCAZfMWvIjlYcN1Cr4LXDw
The following user(s) said Thank You: Juzzie, Simomax

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1 month 2 weeks ago #6929 by Simomax
Very nice! A thing of beauty and a joy forever! I really need to get my collection documented. Maybe we should have a forum just for vintage counters and and related equipment? 

I'm very curious about the detector. Six wires? It may be the type that is mentioned in that document I posted. Looking at the two trim pots for calibration I do suspect that it is designed for high levels of radiation. If you ever see that meter move, run! 

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