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50 milliamperes absorption accurate amplifier anthracene Apparatus beryllium window tube bright calibration chrysene cm.3 per sec constant potential operation degree of spatial designed to determine deter dosage field dosage measurements energy error estimated exposed to X-rays extrapolated fairly fluorescence focal spot full wave high degree high dosages intensity inverse square law Laboratories Lewis lucite rod luminescent plastic maximum measured value ments million roentgens negligible neighborhood obtained operated at 50 optically clear Output Measurements phosphor photomulti photomultiplier tube plastic pick-up plier Polymerized Plastic polyvinyl carbazol portable produced proportional proportionality QQQQ Radiation range readings recoil electrons relative results are shown roentgen rate roentgen unit roentgens per minute Rogers and Braestrup saturation effects showed shown in Fig small grain soft spatial resolution suitable material surrounded T.H. Rogers tained test was designed Therapy thimble chamber thin-walled ionization chamber tube operating value of Rogers VALUES SHOWN voltage Wilson