Science/Engineering/Technical forums

Good on all. Don't like Al? Use brass/copper. Ever see a Nancy Wood Bf3 tube?

Mu Metal ready, just send sddress private email. Geo

Got Mu Metal around that PMT??? Always a good idea.

Ferromagnetic domains will change in that steel tube when it is moved in relation to the earth's magnetic field. Inside the PMT, the electron beam, especially those from the photocathode and first dynode will shift. This is of course not good for ...

See the patent .pdf.

This German company states "It has long been known".......... that a layer of ZnS(Ag applied to and around a scintillation
crystal will boost the low energy gamma detection capability, down to <30 keV to about 15 keV.

This was a recent topic on the Spectrometry board where ...

The circuit is stable and there have been hundreds of examples built up but only after thorough bench testing of the design. .
Input diodes have been added with good results, but by and large we find they are not needed. Variations of the HV + Signal Splitter Combiner circuit is also well ...

This is just a stub/ I'll drop the whole article here somewhere in a fresh thread when it is better formatted for this forum.

MOVING TARGETS.

We have a number of parameters to play with in the Home Rad Lab equipment.

Ludlum makes it easy for end users because they know their market well. All ...

Doug, none of my scintillators are special. I do try to use 9 or 10 stage PMTs for good gain but everything is standard from there. I use either 60 meg or 100 meg bases and a single wire feed for most applications. Only on the main MCA do I use a commercial base with preamp inside and lower dynode ...

Geiger Counters designed specifically for GM tubes have an input sensitivity in the hundreds of milliVolts.
This is fine for GM tubes as they can provide a signal well into a few Volt range, and there is no need
to add system gain which increases system noise.

When using scintillator probes on such ...

1800V is he range you will need for a gas proportional tube like He3, PLUS a lot of gain. On a handheld meter it would be equiv. to 2 milliVolts input sensitivity.

Be sure to measure the applied HV with an ultra hi Z test meter, I use 1000 Megs

Anything lower loads down the supply, gives false ...

My HV/Gain looks like 850V and more gain I think. Nother over 1K, ever. Geo

Time Nuts. The ultimate timing experiment.

Measuring the distance from my house to the moon.
Send a radio signal to the moon. Time how long it takes to get there, and then bounce back. Be sure to divide by 2.

True story have done it hundreds of times. also to all 50 states and 35 foreign ...