Abstract
The electrical and mechanical requirements are discussed from the points of view of designer and user. Instruments described in detail are: (1) A 4-channel logarithmic ratemeter employing Geiger counters and used typically for blood circulation investigations; (2) Clinical monitor using a Geiger counter, for tests not requiring high accuracy and where compactness and porta. bility are desirable; (3) Recording count-rate meter employing a scintillation counter, particularly useful for recording transient phenomena lasting only a few seconds; (4) Standard s-y ionization chamber for checking the activities of solutions of radioactive isotopes.
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