Hi all! The group has become quite silent! Please post about your progress on your own detectors or graphs with nice data or ideas for designs or ... Don't be...
In a message dated 3/9/2004 4:03:26 PM Eastern Standard Time, ... Thank you. Synchronicity here. A few weeks ago someone offered a circuit entitled, "Muon...
Hi Ed, Hannes and all... 555 timers, at least in the TTL family, are fairly hardy devices. It is quite difficult to fry one if the supply rails are 5 volts or...
Mine is up and running. Based on Aware's Aw-Radw software and two Aware RM-70s and a C-Box. Anybody wanting a screen shot send me an e-mail (Yahoogroups don't...
... Thanks for the plug John. ;) I've been struggling (literally) with the draft of an article for some time now on the apparatus and data from a series of...
Joseph DiVerdi
diverdi@...
Mar 10, 2004 3:00 am
80
... I've been struggling (literally) with the draft of an article for some time now on the apparatus and data from a series of experiments I performed some ...
Hi Joseph! Thanks a lot for the very interesting article!!! :-) ... I'm not sure what you mean by the above statements. If you have 2 detectors at the same...
... Hannes, You're welcome. :) Cosmic rays interact strongly with atmospheric atoms and give rise to a *shower* of particles (rather than a single particle) at...
Joseph DiVerdi
diverdi@...
Mar 11, 2004 3:03 am
86
John, ... Interesting and annoying problem. Your experience has confirmed my prejudice for placing the HV source, detector interface, and coincidence circuitry...
Joseph DiVerdi
diverdi@...
Mar 11, 2004 3:12 am
87
... Hi Joseph! Just a quick question before I leave to work: Do you mean that the demonstration of a neglectable false background count rate is a big dream or...
... Hannes, Hope you enjoy your day at work. ;) I meant that a big dream of mine is to demonstrate negligible background rate. It shouldn't be all that...
Joseph DiVerdi
diverdi@...
Mar 11, 2004 7:03 am
89
Hi all! Just watched the press conference on the 2 Mars Rovers and they presented a set of images with SEU's: ...
Hi Joseph! ... Good one ;-) ... Do you have any wild guess about the ratio of false counts vs. positive counts ? 10% ? 25% ? 50% ? And what countermeasures are...
... Hannes, No wild guess can be made without knowing both: (1) the background radioactive decay rate, and (2) the experimentally selected coincidence...
Joseph DiVerdi
diverdi@...
Mar 12, 2004 6:08 am
92
... From: Joseph DiVerdi [mailto:diverdi@...] Sent: 11 March 2004 03:12 To: particledetector@yahoogroups.com Subject: RE: [particledetector] Post...
<snip> ... </snip> John, Sorry for not being clear. In my mind (and my circuitry) the length of the *pulse detector output* is of only secondary importance...
Joseph DiVerdi
diverdi@...
Mar 12, 2004 3:38 pm
94
Joseph Ahh!...I see what you mean and agree. My 'Pulse detector module' takes its input from the source pulse from the GM tube and outputs a neat, clean 10uS ...
... <snip> Although my tubes chatter at about 70 counts per minute, I am going to assume 60 counts per minute for the sake of simplicity here. I am also going ...
Joseph DiVerdi
diverdi@...
Mar 13, 2004 5:21 am
96
Hi Joseph I'm not sure that I understand what you mean when you say ... "...the probability that one or more events will be detected by a single detector..." ...
Hi Hannes: My scintillator/photomultiplier output was not large enough in amplitude to trigger the 555 chip, and the pulse widths were minuscule, less than 10...
Hi all! Today I started to build the first detector (not yet glued together). Currently I have setuped a detector with only one ground plate and the HV grid...
... Hi John! Yes, the 555 circuit behaves as it should ... Meanwhile I think that the normal air pressure incl. the moisture is the cause. But at 300V ? ...
Hi all! I found the problem! The 555 input signal must be inverted after the detector-to-ground resistor! *duhh* ;-) I didn't find a 4049 as in Joseph's...
... I just connected a loudspeaker to the output of the 555 and the 'plateau' is about 250V wide (not exactly sure about this value, since I don't know the...
Hi all! The subject says it all ;-) Some people say it's possible - some say it isn't... On the other hand I thought about thin copper sheet for the ground...
... Long time ago I bought a roll of special SnPb wire at a fair, specified for aluminium soldering, but I never tried... :-) The problem is breaking the...
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