Search found 130 matches

by ChrisSmolinski
Fri Jun 13, 2003 11:13 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Canberra 35+ MCA Help Needed
Replies: 24
Views: 5281

Canberra 35+ MCA Help Needed

<t>I recently acquired a Canberra 35+ MCA. The good news is <br/> that it powers up. The bad news is that is about all it does. <br/> Well, if I press the RESET? button on the display card I get it <br/> to say Canberra on the top line of the CRT, and display two <br/> lines of >>> on bottom of the ...
by ChrisSmolinski
Thu Jun 12, 2003 12:57 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: (XRF) - Gamma spectroscopy - revisited
Replies: 7
Views: 3035

Re: Gamma spectroscopy - revisited

<t>My memory is hazy, but I think we had fairly good results with the CZT detector. We were doing something with a Cs137 source, but I cannot remember exactly what, being five years ago. I think looking at backscatter. The Si detectors are of course useless above 100 keV, as you said. Even at 60 keV...
by ChrisSmolinski
Tue Jun 10, 2003 6:59 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: (XRF) - Gamma spectroscopy - revisited
Replies: 7
Views: 3035

Re: Gamma spectroscopy - revisited

<t>I had the pleasure to use an Amptek XR-100 at a previous job (I was the one who bought it actually, as well as one of their CZT units for higher energy use). We used it mostly for characterizing the spectra of x-ray sources. I was a blast to place a piece of stainless as a target, and observe the...
by ChrisSmolinski
Fri Jun 06, 2003 11:55 am
Forum: Books & References
Topic: The Atomic Nucleus- R.D. Evans
Replies: 1
Views: 6232

The Atomic Nucleus- R.D. Evans

<t>This book was recommended to me 15 years ago, as a general nuclear physics reference. I still have my copy (snagged for $4 from a local used book store of all places, never underestimate them, they sometimes get serious texts, and don't know what they really have) and still refer to it from time ...
by ChrisSmolinski
Tue Jun 03, 2003 11:56 am
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - Details on Be- Alpha neutron generators
Replies: 5
Views: 4011

Re: Details on Be- Alpha neutron generators

<r>Richard Hull wrote:<br/> > A full Curie of Am241 should produce about 3X106 n/sec, but this is rarely achieved. <br/> <br/> While skimming through an Amersham catalog, I took a look at their Am241/Be neutron sources. They claim 2.2x10^6 n/sec for 1 Ci. Interestingly, half a mCi of Cf252 has the s...
by ChrisSmolinski
Thu May 29, 2003 5:52 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: A nuclear amusement - Tungsten
Replies: 5
Views: 1958

Re: A nuclear amusement - Tungsten

<r>Here is the text of the article, appologies for poor formatting:<br/> <br/> Not even bismuth-209 lasts forever<br/> <URL url="http://www.sciencenews.org/20030503/note16.asp">http://www.sciencenews.org/20030503/note16.asp</URL><br/> <br/> Peter Weiss<br/> <br/> Many heavy elements radioactively de...
by ChrisSmolinski
Thu May 29, 2003 12:07 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: A nuclear amusement - Tungsten
Replies: 5
Views: 1958

Re: A nuclear amusement - Tungsten

<r>FWIW, according to Science News, researchers at the Institute for Space Astrophysics in Orsay, France have found that Bi-209 is actually radioactive - via alpha decay, with a half life of 1.9e19 years. Apparently this was postulated 50 years ago. They used bolometers to make the measurements, not...
by ChrisSmolinski
Thu May 22, 2003 1:57 pm
Forum: Books & References
Topic: Korff: Electron and Nuclear Counters - question
Replies: 3
Views: 4377

Re: Korff: Electron and Nuclear Counters - question

<t>Yes, I remember seeing several books printed on "ration paper" while browsing the stacks of the U of Maryland engineering library (usually while looking for something more interesting to read than what I should have been working on). <br/> <br/> His texts are easy to locate, I found a 1946 (secon...
by ChrisSmolinski
Wed May 21, 2003 2:23 pm
Forum: Books & References
Topic: Korff: Electron and Nuclear Counters - question
Replies: 3
Views: 4377

Korff: Electron and Nuclear Counters - question

<t>I managed to snag a second edition (1955) for $7 from alibris, just got my copy yesterday, and am anxious to start reading it today at lunch. From scanning through it last night, it looks interesting. One question for anyone who has multiple editions: I understand material was removed from this s...
by ChrisSmolinski
Fri May 09, 2003 4:58 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Background counts
Replies: 14
Views: 3198

Re: Background counts

The 7127 is also rated for 500 volts. You're able to
operate it at 900V?