A decade or so ago the instrumentation needs of radiologists, of x‐ray technicians, and of persons working in industrial radiography were met largely by a few manufacturers working in close cooperation with the x‐ray division of the National Bureau of Standards. The special problems then encountered in physics laboratories were made relatively minor by taking sensible safety precautions. More recent developments in work with high energy particle accelerators and with nuclear reactors and weapons have extended the physicist's problem with regard to the energy range over which the instrument must give true dosage readings, the radiological intensity ranges which must be covered, and the numbers and types of personnel it may lie necessary to protect—or risk, if such an occasion should arise.

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