![]() ![]() According to the WHO, "Although aircraft cabins are pressurized, cabin air pressure at cruising altitude is lower than air pressure at sea level. ![]() Re: "ear barometer"-Could I feel a reduction in air pressure in an airplane cabin? Not to any significant extent, if I remember rightly. So basically, a very common pancake style GM tube for detecting alpha, beta & gamma/xray’s. Effective diameter of window is 45 mm (1.75 in.)” ”RAP-RS2 Probe - External Halogen-quenched, uncompensated GM tube with thin mica window, 1.4-2.0 mg/cm2 areal density. According to the specs listed on its using a: Im planning on buying a Radiation Alert Ranger EXP. I don't know which detector do you use, but if it is with an external probe, maybe you can get one russian SI-8B tube, which are shown from different users to survive at high altitude and even if not, you loose half the amount of money you mentioned :) I also have one Philips ZP1431 with d~30mm mica window, which flew between eastern and western Europe and also survived, but of course we have to ship at least 10, to different locations and then make a conclusion. But the producer warns in the manual that "The GM tube face can rupture above 8000 feet in altitude", so cases like this should also exist. I got one Ludlum model 44-9 probe with a LND7311 GMT shiped all the way from USA to Europe in a non airtight container and it survived. I guess nobody can guarantee it, but you may have good chances not to loose the tube. ![]()
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