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The radioactivity indicator "Pioneer" has been produced since 1962 by the Kiev plant "Radiopribor". At the heart of the ITS is the STS-5 meter, to which a 300 volt voltage is applied, which is obtained using a transistor converter, a transformer and a rectifier. When ionizing particles get into the meter, a corona discharge flashes and a pulse appears in the external circuit of the device, which causes a click in the dynamics and a flash of the thyratron. Thus, the intensity of clicks can be used to judge the intensity of radiation. For the STS-5 counter, the natural background gives 27 pulses per minute.