Word: detectable
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...apparatus is designed to detect radiation from outer space in three wave lengths: 3, 10, and 30 centimeters. All these penetrate the atmosphere, which is opaque to all other waves except those in the neighborhood of visible light...
According to Oldenberg, the reason that Geiger counters in the Rochester, N.Y. area were able to detect radiation after Saturday's snow is that the instruments are exceedingly sensitive. "If you approach a Geiger counter with a wrist-watch which has a luminous dial, it will sound like a thunder-storm," he pointed...
...curvature of the earth (see diagram). So a radar station works best against high-flying airplanes. It can pick them up as far away as 150 miles, but if attacking bombers fly low, they can keep behind the bulge of the earth and get much closer before they are detected. With mountains or other obstacles to give them shelter, they are even harder to detect in time for effective warning...
Leathery, poker-faced U.S. Ambassador Alan G. Kirk, Admiral, U.S.N. (ret.), came home for a holiday visit from his Moscow post, where he had found himself a mariner becalmed in the eye of a hurricane. He slipped in quietly to see Harry Truman, reportedly told the President he could detect "absolutely no evidence" that Russia is about to start...
Besides the radiological reconnaissance teams, says Colonel Wilkinson, each target city should have at least 100 trained men with instruments to detect "personal contamination" (radioactive clothing or skin). There should also be a central laboratory with highly trained personnel for checking instruments and dealing with unforeseen problems...