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Wow , that was worth looking at, I never would have expected that. Good scientific procedures. Now the question of where its coming from. Start with the chamber i.e get rid of it. we shouldn’t need

Thanks. If you want you could do this - make me a group monitor and I'll get it going. Then I'll see what kind of access permissions I need in order to maintain it and you can downgrade me to that

Yes please do, if it requires being a group moderator, let me know I can make you moderator no problem. Geo

Great on the Si-PIN Soren!If I can be of any help let me know......I can't help with wiki, and have no idea what it is. My biggest issue is my web host ( a Ham Radio group) made me take down all my

Thanks I'll read and digest this message shortly. Right now let me jump back to this one and correct myself: " Geo, In order to compare and try to quantify these samples they both need to have been

Thanks so much. Yes, as you probably noticed above, there is a link to the 142PC schematic. What's missing is the illusive identity of the Q1 FET and the Q11 BJT. What they actually are probably

Thanks for the info Geo. Also, Here is a block diagram for the Ortec 142PC. https://www.ortec-online.com/-/media/ametekortec/manuals/142pc-mnl.pdf That is a pretty good starting point. Next step is to

Geo, The amount of Pu-240 in that era of devices was about 2.5% with Pu-241 of about 0.05%. If you look at the Green Top CdTe 86Ksec mca again the Pu 240 appears at 45.24 next to the Pu 239 at 51.62

Oops, It looks like it is actually the Ortec 142PC that is optimized for proportional counters. https://www.ortec-online.com/products/electronics/preamplifiers/142pc Same issue re a circuit diagram.

See attached paper, preamp schematic coming via private eMail/ Geo

I know that proportional counters are/were used ad detectors for low energy XRF in the wavelength dispersive mode (i.e., using a crystal surface like an optical diffraction grating. Nice. Plain Ar

Thanks Soren, I myself am looking forward to that- it is new technology, and holds a great deal of interest for meGeo.

Since a discussion got started here on Raman and there might be some interest, I started a thread over at?GeorgeDowell-XRF-NDT-LAB for anyone who cares to join in. That way it won't clutter up the

A while back I bought a small proportional counter on the cheap from eBay but I've never got it going for lack of a preamp. It seems like it will will work down in the low energy range and might be

"Rope Trick Effect" explained. Energy jets are directed into a beam by cables strung from the Trinity tower. These precede the actual fireball. There were at least two major aerial runs of power and

There seems to be some information on the wiki here: /g/GroupManagersForum/wiki/14936 If GEO thinks its a good idea, perhaps he could enable it.

I noticed that there are a a number of resources in the files section, but the Wiki is empty. There is so much good information in these threads and I'm just starting to comb though it as I get

" Geo, In order to compare and try to quantify these samples they both need to have been run for the same live time (The Red has 25% more run time), HV, and current. Both would need to interrogate the

Geo, In order to compare and try to quantify these samples they both need to have been run for the same live time (The Red has 25% more run time), HV, and current. Both would need to interrogate the

Red vs Green Trinitite via XRF I was expecting a larger difference in content based upon the vastly different look and phase of metal inclusions and color. Except for distribution %, it seems both are