Abstract

A comparison of the attainable characteristic physical data for whole-body radioactivity detectors (high-pressure ionization chambers, NaI crystals, and liquid organic scintillators) shows that the only advantage of NaI-crystal detectors is better energy resolution. For all other criteria (optimal counting geometry, reproducibility of the counting geometry, overall efficiency, sample volume size, minimum detectable radioactivity, and required minimum counting time) the whole-body radioactivity detector with liquid organic scintillators is superior to all other large-volume detectors.

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