Index-coupling gel or index-coupling glue optimize the transmission of light between optical elements. Otherwise you will have reflections at the interface...
In a pinch I have known people to to use silicone spray lubricant. By spraying into a cup and allowing the solvent to evaporate sufficient gummy residue may...
The talk of the 111 b without the tube got me started thinking (yet again) of the history of the PRI company. I found a comment on the PRI record site on the...
Ludlum sells the gel in a big tube. Enough to last a lifetime. Do NOT use the gel on the ZnS end. It will migrate to the powder and mess it up. This advice...
Paul Frame has been very helpful to me in the history dept. You probably know of him. You can email him from the ORAU site. A very helpful and nice person ...
I'll vouch for Ival at Radiation Sensors. His small outfit is about 10 mi N of Huntsville, where I am. My only connection is as a satisfied customer. I have...
Ival knows his stuff! He has replacement crystals for he 117b too, and is familiar with it. Unfortunately his prices are out of my budget (but still not...
"Thanks though for the lead. I might be better off buying a junker PRI 111B." Has anyone purchased an unreastored 111b or 111b with a good crystal? Chris...
after many many old scint counters from ebay, the only one that was clear as crystal was in a Fisher Scintilliscope. possibly due to a well made aluminum ...
Ivan called by by phone and sold me a 'hobby grade' 1x1" NaI crystal for $50.00. For some reason, the initial email quote was very high, about $200. He told me...
I removed the analyzer circuit board and connected direct to the voltage divider network at the base of the tube. I inserted a thin mylar window in the end of...
... Radon is implicated in lung cancer, I think, not leukemia. Given her age at her death, it is almost ... That's like saying that being poisoned is merely...
I'm sure this has come up before, but here goes anyway, The compound Ludlum's sell (and most others use) is Dow Corning DC4 silicon grease (formally Midland...
Hi! Off topic, but we can hardly contain our enthusiasm! Our home radiotelescope saw "first light" today. My oldest daughter and I observed a solar pass at...
I thought the refractive index of the compound was important to make that seamless transition from the xtal to the pmt ... Best Regards, Chuck Abraham...
I have several PRI radium calibration discs, they are now about 50 years old. Will they still be reliably accurate (or at least close enough), considering...
There is a lead isotope pig on ebay for sale http://cgi.ebay.com/RADIOACTIVE-ISOTOPE- CONTAINER_W0QQitemZ7550426426QQcategoryZ26228QQrdZ1QQcmdZViewItem I would...
... years old. ... considering their age? ... Well, I just did a Google on Radium Half Life, and came up with a figure of 1622 years, by one of the guys who...
According to the Universal Decay Calculator, there will be 97.86% left after 50 years. A handy online tool: http://www.wise-uranium.org/rcc.html Geo ... From:...
not really, it will be in equilibrium and also down by about the same amount. Geo ... From: DH To: GeigerCounterEnthusiasts@yahoogroups.com Sent: Monday,...
I just got a deal on a scintillator, Harshaw NaI(Tl) 2" end well detector. The label says Integral Line, Type 8SF8. Serial JL4. This is a complete assembly,...
You did good! Just use the schematic in FILES for a 14 pin base and it will work fine. I have never found a Harshaw or Bicron to leak, therefore no yellowing...
My next door neighbor did come up to ask what I was up to THIS time. I told him with a very serious face that there was a CIA satellite there looking through...
I believe the telecommunications act of 1996 exempts dishes of 18 inches in diameter and less from any restrictions. check with a Radio Shack or other seller ...
Hi Ron! DBS dishes are OK. Everyone around has one (we do too). However, I would like a 12 foot+ dish for the radiotelescope. On the matter of being able to...
Hi every one I was wondering if anyone had a Manual for a Bicron Surveyor M with scaler option that I could get a copy of or down load from. Thanyou Mark....
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