Hi Steve, This is interesting, what type of instrument was it? The situation in the UK is somewhat unclear. Clocks and watches are normally exempt, some...
... <k.gianino@a...> wrote: Very cool project. ... Is this a power transistor in a big squat can ~cms across, or a little metal can ~5mm size? What is the...
Robert, That's an informative web page. It implies that aircraft instruments have higher radiation levels than clocks, so it makes sense that they would be...
There's a freeware oscilloscope program called "DS-2002 Oscilloscope" from dazyweblabs.com. They also offer signal generators, spectrum analyzer, freq counter,...
... Well, I can't argue with that :-) Note that the relevant HL is for U234, not 238 or 235. HL of 234 = 240,000 years. K0FF has a gamma spectrum of a...
... With gammas, you can count only the energies that you are interested in. BUT I think alphas will have a range of energies thanks to collisions with air. ...
Just to let everyone know there are two Canberra 8075s on ebay right now. I am not the seller. Please see my schematic and software under the files section...
Any ideas on specifications or capabilities for one of these? I've only been able to find a pinout diagram on the web. Thanks, Jeff ... right ... Search ... ...
... simple ... selected ... required ... and ... the ... the ... The 'bright' ... trace.) ... longer 'count' ... this ... setup ... due ... sensitive ... For...
Hi Jeff, It is a 100Mhz ADC and can be set for 256 through 8196 channels via a front panel switch. It has the typical front panel adjustments for Low/High...
Just got back from an extended field trip and have boxes shoulder high all over the place right now. When re-organized ( or some reasonable facilmile thereof)...
FYI I duplicated your setup uing a 5" PMT and a light tight container (Ludlum 218). With no scintillation material in there with the PMT, there were zero...
Hi guys- Long time no chat, Larry here! My old accounts (Plural) got hacked, then reinstated with a virus, then Yahoo just killed the thing- its taken this...
Sure enough the screen was contaminated. Probably picked up some Th232 from dust on the workbench; still puting out a high count after some time in the dark....
We just got back to Southwind ( our home lab in Missouri) from the Field Trip 2003/2004. The bulk of the trip was to the desert area of Southern Nevada, and we...
Welcome back! to read Alphas with a CDV 700 all you need is an Alpha sensitive probe. Any 900V rated, thin-mica window unit like and end-winow or pancake will...
I have the PMT running with a +HV supply, capacitively coupled to the scope input. The scope is being controlled with LabView and measuring the pulse height....
Same screen in clear plastic bag does not give high counts, only 30 in 10 minutes. Light goes through plastic but not air. Take out of bag, counts go to...
... That's a fine control too. I'm convinced. Real sensitive screen there, and/or I keep forgetting how sensitive a PMT is. Or you have way too much radon...
George, how long do you dark adapt the PMT and ZnS screen before counting?. The count rate you're seeing seems unreasonable. Radon daughters shouldn't get...
Hi Dudley, yes I have a calibrated Alpha source, it's Th-230. Note from description that counts were not CPM but counts in 10 minutes. My home lab is also...
Ok, that makes better sense. It's a Class-I operator error on my side. I was thinking CPM. However even in CPM I'd suspect you're still elevated. Limestone...
Good to know about U in limestone, will have to look for that. Been playing with the Lucas cell...it's so easy to move the thoron around, I am definitely...
What's the half life of the cell's background? 10.6 hrs or 22yrs? Always use a microsize (0.4u or better) filter when drawing a gas sample into the Lucas cell....
Does anyone have any information at all on the 8076 ADC NIM plug-in? I'm getting one via ebay. Looks like I should have held out for a 8075. I see there's a...
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