Hi Rodney, yes, I think that's what you need to sort out, what the background noise is and/or design some of shielding, like for example a 10 cm lead...
Hi all, recently I bought a neat PMT http://www.cosmicrays.org/tmp/pmt1.jpg (bought from GEOelectronics http://search.ebay.com/_W0QQsassZgeoelectronics highly...
Hi Hannes, The design of light guides (also called light pipes) is a science in and of itself. You have seen many examples of them in consumer electronics, ...
Alexandra, Thanks' for the reply, I think some kind of lead shielding might be best, perhaps a V shape to shield just the ground: \*/ ( where the * is...
Hi Rodney, I am not sure I got your idea with the V-shape shielding, but I guess that before you try any specific shape try a simple planar shielding above...
Alexandra, I'm experimenting with shielding as you suggested. I also do some radio astronomy, and was fortunate enough to get hold of a MODIS satellite...
Hi Rodney, I don't know if I got your idea exactly. So you have a torus magnet and you place it under the Geiger counter, ok. I have some comments: the...
Rodney, Check your shielding material with a counter before you use it, many materials are slightly radioactive themselves. Almost all rock contains traces of...
... At least not with a GM tube. Using a scintillator, you can measure energy and then check if it's a muon or not. That's when I'm going to try, when I have...
Hi all, for all who want to participate in the first RADIATION SKYPE TELECON this evening STARTING AT 6pm EST, 3pm PST (that's a halfway acceptable time in...
... OK, folks that was a little too short-term. I want to ask you all, if there are actually folks around who want to make a voice telecon via skype ? If so,...
Hi all, a new electronics store opened here and I was carefully checking it out today and found something: Regular CCFL high voltage modules, I previously...
Ron, Did you build your two tube detector from this design? http://www.cosmicrays.org/muon-geiger-scr-coincidence.php R. ... From: Ronald Fleshman To:...
... Hi Rodney, since you mention my design, I'd be eager to hear your opinion! (but remember, it's just a "show-off" device for my talks - nothing one can make...
Hello all, I'm a teacher looking to have a student build one of the flat-plate CR detectors as in the SciAm article. Are there good sources of the thin wire...
Rodney, No I did not. I am using two Aware Rm-60 detectors. They use a 712 type tube. The coincidence circuit was made for me by an old radio student of...
... Hi Jeff, [webmaster of cosmicrays.org & group headgeek speaking :-] first of all I need to say that the flat detectors are not in operation yet (despite...
... Whooops...was meant as a private reply. Now that you all know my Skype ID, I'm open for a chat, but please don't use it too extensively! Cheers, Hannes. --...
... Hi Ron, you have a directional coincidence det ? Cool! BUT :-) What is the spacing of the tubes ? Must be more than a meter, otherwise the travel time of a...
... If you want some *really* thin wire designed to withstand high voltage and corona, get a reel of photocopier/laser-printer corona wire. Alternatively, pull...
... Hannes-- I was intending to evacuate the space between the plates, as in the SciAm article, and fill with argon. That should work, yes? Or is there some...
Hi Jeff, ... I don't know. As I said, I started the AmSci project in 2003 and as you can see at cosmicrays.org , I've built the detectors, had major issues...
Hi Hannes, ... Is there a reason the paddles have to be angled & widely separated as yours are in your drawing? As long as they are optically isolated from...
Hi Jeff, ... No, it's some "odd" design, since I want to use "just 1 PMT": http://www.cosmicrays.org/tmp/pmt1.jpg Looks like a regular PMT, but there are...
... like a regular PMT, but there are actually 2 PMTs inside. ... I'd ... sufficient ... Hannes, We're thinking on the same lines, I believe. All air would do...
Hi Jeff, ... Yep, thinking on the same lines! :-) Well, on the other hand, meanwhile, I have not that big problem with false detections, since with that small ...
Hannes, You picked up on something I completely overlooked. Muon transit time. My tubes are less than a meter apart. Back to checking and testing my set...
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