A continuous alpha air monitor compensating for the natural atmospheric radioactivity
University of California Radiation Laboratory, 1955 - Science - 26 pages
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68-Mev alpha particles 7C 68-Mev alpha activity present adjust AIR MONITOR COMPENSATING ALPHA AIR MONITOR alpha counts alpha emitters ATMOSPHERIC RADIOACTIVITY David atoms of radium CAAM calibrate switch California Radiation Laboratory chassis see Fig0 CONTINUOUS ALPHA AIR counting geometry dangerous concentration dangerous isotopes daughter products David R0 Sawle decay constants decay products energy Equation of form error FC FC geometry of 25 give a positive half the maximum high-energy instrument long-lived activity maximum permissible daily meter reading molecular filter paper natural activity NATURAL ATMOSPHERIC RADIOACTIVITY Natural Radioactivity NAXA NBXB FC Ncxc Nucleonics number of alpha number of atoms permissible daily dose phototube plutonium positive indication potentiometer pulses0 RADIOACTIVITY David R0 radon at 16 radon concentration radon daughters represents the number right-hand low-energy alpha sampling time0 source strength0 subtracted Total Counts total number total radon activity uranium warn the operator XANA XBNB XC"XA zero