Abstract
Abstract An automatic machine has been constructed to count proton- recoil tracks in nuclear emulsions used as personal dosemeters for fast neutrons. The machine uses an opto-mechanical fast scanning arrangement to examine 0.8 mm 3 of emulsion in 12 min. A maximum number of 60 track plates can be examined automatically in 12.5 h. To discriminate between proton tracks and aggregates of grains in the emulsion, it is necessary to ignore track lengths less than 5 μm, corresponding to 0.5 MeV protons. The energy response shows reasonable agreement with that expected by calculation, and calibration of the dosemeter/reader combination by Pu-Be neutrons gives a linear relationship up to 4.5 rem with a background of 0.1 rem.
Published Version
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