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This auction is ONLY for Installation kit for the LND 7317 geiger tube or ANY Pancake tube with the same dimensions as the LND 7317 such as the 7311, 7312, 7314, 73132 No geiger tube is included in this sale. These items make it very convenient for installing the Geiger tube and includes Grill and Gasket to protect the delicate mica window of the tube. LOOK AT THE PHOTOS FOR EXAMPLES OF THIS KIT BEING USED ITEMS INCLUDED IN THIS KIT/AUCTION 1. Copper bracket w/ double sticky foam 2. Steel grill 3. Rubber gasket- Raises the tube above the grill to help protect the mica when bowing occurs from high altitudes. SEE BELOW 4. (2) high voltage cables, 20 gauge, now in RED and BLACK 5. (2) Shrink tube 6. 4.7M ohm resistor 7. Fuse clip for anode connection 8. FREE RAD sticker NO TUBE INCLUDED In case you didn't know this information about the delicate mica of the LND 7317 pancake tube, READ THIS: IMPORTANT INFORMATION CONCERNING PANCAKE GEIGER MULLER TUBES AND HIGH ALTITUDE: All makers of pancake tubes ship them in sealed tin cans (paint cans). All Atomic.dave Geiger counters with pancakes are shipped inside Pelican atmospheric controlled cases. Also the GC design includes a gasket-spacer for reverse-bow window conditions. Even in the passenger compartment a Pancake detector (LND 7317, 7311, 7312, QPL 8767 et al.) is at risk. LND and Ludlum Measurements rate them only to 8000 feet altitude. Passenger compartments on commercial jets are supposed to be pressurized to 8000 feet equiv. Because at this altitude the mica window on a regular pancake (gas fill is at less than 1 atm.) reverses its bow direction, from slightly inwards to slightly outwards, I designed my Geiger counters with a rubber gasket between the tube face and the stainless steel screen to accommodate this motion. Bill Lehnert of LND today verified: LND 7317-Routine operation at 5000-6000 feet no problem, i.e. Denver, Los Alamos. Above that they work fine until the reverse bow becomes a problem in the housing. Once the bow has reversed, the tube will continue to work fine. It is not a good idea to cycle between high altitude and low altitude, as eventually the seals will suffer. LND 712- the small 500V end-window used in so many pocket-sized portables will work at full vacuum. A great selection for Alpha Particle experiments inside a vacuum jig. Gamma sensitivity 18 CPS. LND 72344 (500V) or LND 72310 (900V) are actually described as end-window not pancake. To me they look like a small pancake. They are good somewhere between the 7311 and 712, so would be a very good candidate for a high altitude probe, still retaining a good Gamma Sensitivity number of 25. (End of Bill's contribution) It's really hard to beat a LND 7317 based geiger counter for general-purpose field work (60 CPS/mR/H Co-60). The transportation issue is a real one, so make arrangements for that. For routine high altitude usage, you might want to consider another type of tube. No Geiger Counter tube is included in this sale. I CAN ACCEPT CREDIT CARDS WHEN YOU PURCHASE THIS ITEM, IT WILL ROUTE YOU TO PAYPAL WHERE YOU HAVE THE OPTION TO USE CC AS PAYMENT COMING SOON FULL FEATURED TEKOs with Desktop CI-8B Probes FULL FEATURED BORGs with sensitive Russian SBT-11A tube 2 GK6-plus with LND7317, Pelican Case, GPS, SD card data logger |