Search found 142 matches

by George Dowell
Tue Feb 19, 2013 11:35 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Guidance needed - PMT with a Harshaw/Filtrol NaI(Tl) X'tal
Replies: 8
Views: 3287

Re: Guidance needed - PMT with a Harshaw/Filtrol NaI(Tl) X'tal

That's better and is the standard wiring we use on hand held, portable , battery operated instruments, to keep from loading down their HV power supply. Good for general purpose work, but the improved schematic is better for MCA, if the MCA can handle the current draw.

George Dowell
by George Dowell
Mon Feb 18, 2013 6:37 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Guidance needed - PMT with a Harshaw/Filtrol NaI(Tl) X'tal
Replies: 8
Views: 3287

Re: Guidance needed - PMT with a Harshaw/Filtrol NaI(Tl) X'tal

My improved 14 pin base for MCA work. The option is to double the value of the bottom resistor, but this arrangement works very well, as long as the power supply can handle the load.

George Dowell
by George Dowell
Tue Feb 12, 2013 10:03 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Worlds smallest Fusor.
Replies: 17
Views: 5552

Re: Worlds smallest Fusor.

<t>The Monitor 4 does not have a GM tube saturation feature, neither does Ludlum Model 3 etc.<br/> <br/> A GM tube when overloaded, will simply saturate, the meter will read zero CPM.<br/> <br/> IF you MUST use a GM tube for X-Rays at least use something like an AWARE meter, which will not saturate ...
by George Dowell
Mon Feb 11, 2013 9:07 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: MCA Freeware.
Replies: 0
Views: 1013

MCA Freeware.

<r>In order to see the latest version, go to this link:<br/> <br/> <URL url="http://www.theremino.com/en/downloads/radioactivity/">http://www.theremino.com/en/downloads/radioactivity/</URL><br/> <br/> <br/> and the blog:<br/> <br/> <URL url="http://www.theremino.com/en/blog/gamma-spectrometry/">http...
by George Dowell
Fri Feb 08, 2013 3:35 am
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - X-ray radiation!!
Replies: 41
Views: 27770

Re: FAQ - X-ray radiation!!

<t>While interesting, such a test is not really quantitative, because you are experiencing the low energy cut off of the GM tube walls. In other words, does the X-Ray flux really increase, or does the raised energy just allow more to get inside the tube?<br/> <br/> This is the big stumbling block wh...
by George Dowell
Fri Feb 08, 2013 1:25 am
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - X-ray radiation!!
Replies: 41
Views: 27770

Re: FAQ - X-ray radiation!!

<t>To quote Dr. Gordon Gilmore from another forum:<br/> <br/> The point about nomenclature is that it does give information about origin<br/> and mechanism of production. You could suggest that we call any<br/> electromagnetic radiations as photons - and scrap all that nonsense about<br/> radio wave...
by George Dowell
Fri Feb 08, 2013 12:16 am
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - X-ray radiation!!
Replies: 41
Views: 27770

Re: FAQ - X-ray radiation!!

So the Deuterium ions are the canal rays?

George Dowell
by George Dowell
Thu Feb 07, 2013 11:21 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Silver inner grid
Replies: 12
Views: 3296

Re: Silver inner grid

Rich have you given any thought to the SIZE of the wire in the grid, in terms of Voltage gradient?

George Dowell