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During the last few years there has been considerable activity in the field of high level gamma ray dosimetry. New dosimetric methods have been developed, and experience has been gained in the use of older methods. However the field is still characterized by a multiplicity of methods and approaches. It seems appropriate, therefore, to review recent developments and assess the present status of gamma ray dosimetry.
Among the recent developments discussed in this paper are experimental evaluations of a large number of integrating (total dose) dosimeters; improvements in the cerie sulfate and anthracene (luminescence degradation) dosimeters; new plastic, glass, and luminescence dosimeters; and recent developments in dose rate measurements with ionization chambers, calorimetry, and semiconductor radiation detectors.
In summary, good liquid dosimeters are available for total dose measurements in the range 104 to 108 rads, and usable solid dosimeters exist for the range 104 to 5 × 109 rads. However, better solid dosimeters are still needed. In addition, satisfactory ionization methods are available for high dose rate measurements, and a recently announced graphite sphere calorimeter shows considerable promise as a primary standard for absorbed dose measurements.
Stanford Research Institute, Menlo Park, Calif.