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air alpha air contamination air region airborne alpha contamination airborne beta emitters AIRBORNE CONTAMINATION ALARM ALARM AND RECORDER alarm circuit alpha activity alpha background alpha emitters alpha-emitting substances background count background rates bursts of activity c/m/chamber calculated capacitor CATHODE FOLLOWER cc of air Chamber counting contamination level contamination ranges counting volume counting wire counting-rate-meter counts full scale counts per minute cylinder see Figure detection of airborne detector and reference detector chamber detector counting rate device feet of space Figure 12 filter paper method guard ring high sensitivity high voltage hood door immediate warning impulse registers inner cylinder insulators interval microgram Miniaturization normal background permissible limit plutonium pounds and occupies PULSE SHAPER pulses are accumulated random counting fluctuation recorder chart showed reference counting rate REGISTER DRIVER sample September 23 shown in Figure spill steam jet aspirator tamination tion Trial Operation Experience TRIGGER PAIR twenty-four hours VACUUM TUBE vapor voltmeter