Is there radiation? Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Is there radiation? Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Indicators, detectors, metal detectors

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Our simplest indicator will answer the question. He will warn not only about the level of background radiation, but also help to check for contamination of water, soil, food.

As you can see, the circuit of the device is simple. Its basis is an ionizing radiation sensor. It is a small cylindrical glass bulb filled with gas, with two electrodes at the ends. The sensor is included in the base circuit of the transistor VT1, which controls the inclusion of a neon light bulb HG1. A high, about 600 V, constant voltage is applied to its electrodes. To get it, use a voltage doubler on diodes VD1, VD2 and capacitors C1, C2.

Is there radiation?
Radioactivity indicator

When there is no ionizing radiation, the resistance between the sensor electrodes is infinity, the transistor VT1 is closed and the HG1 light is off. But then a charged particle ran between the electrodes and left an ionized channel in the gas filling the flask. And he, as you know, conducts current. The transistor will immediately open and light the bulb for a short time. The more charged particles run through the sensor, the more often it will flash.

Now a few words about the details. In the indicator circuit, you can use diodes of the KD103 type, KT605 transistors with any letter index. Neon lamps IN-6 or TN-0,2 are suitable as the indicator itself. The ionizing radiation sensor can be of any type, designed for an operating voltage of 360-540V - for example, SBM-21, SBM-11, SBM-20, STS-20 or STS-5.

Structurally, the device is best done in a case made of hardboard or plastic. Opposite the place where the sensor will be placed, provide a small rectangular hole in the side of the case and close it with polyethylene. The performance of the device is determined by the flashes of a neon lamp. Remember that the circuit is powered by high voltage! So when setting up and repairing, do not forget to disconnect the device from the mains!

Author: V.Kubyshkin

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