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A highsensitivity magnetoresistive magnetometer

The dosimetry of stray radiation fields around pulsed accelerators is complicated by the fact that the radiation comes in pulses and by the mixed nature of the radiation usually produced by these accelerators. Suitable instrumentation for pulsed radiation consists of special uses of standard ratemeters and counters and integrating type ion chamber instruments. Fixed monitors and personnel monitoring schemes must be adapted to this special use.If a mixture of radiation is to be measured with ionization chambers, the physical dose can be obtained if the chamber is tissue equivalent, but an effective or weighted average value of r.b.e. must be determined to obtain the biological dose. An experimental procedure using a cloud chamber has been developed to measure the distribution of 1.e.t. Stereoscopic photographs of the tracks in the cloud chamber are taken. The length of every track is measured and the optical density classified. By calibration with tracks of known particles, the energy deposited in the sensitive volume from different 1.e.t. classes can be calculated. An effective r.b.e. is obtained from values of t.b.e. as a function of 1.e.t. as tabulated in NBS Handbook 59.