Infrared, X-ray and gamma ray indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Dosimeters
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The circuit diagram of the indicator is shown in fig. one.
(click to enlarge)
Cadmium sulfide photoresistors R1-R4 of the FSK-7B type form, together with capacitors C1, C2 and resistors R5, R6, a Wien bridge. The latter is included in the positive feedback circuit of the RC oscillator on transistors T1 and T3. The frequency of oscillations generated by it depends on the resistances of the photoresistors R1-R4, resistors R5, R6 and the capacitances of capacitors C1, C2. The photoresistors are covered with a filter that transmits only infrared, x-rays and gamma rays.
On transistors T5 and T6, a second RC oscillator is made, which differs from the first only in that instead of photoresistors, resistors R25-R27 are included in the Wien bridge. The outputs of the RC generators are connected through capacitors C6 and C18 to a mixer in which the transistor T3 operates.
In the absence of radiation, by adjusting the resistances of the dual variable resistor R26a and R26b, the frequency of the second generator is set equal to the frequency of the first generator (about 30 kHz). At the same time, zero beats are observed in the telephone Tf1 included in the collector circuit of the transistor T4, which operates in the amplifying stage.
When the phototransistors are exposed to infrared, x-ray or gamma rays, the frequency of the generator on transistors T1 and T2 changes in proportion to the intensity of irradiation, and at the output of the mixer, difference frequency oscillations audible in telephones are obtained. The pitch of the sound increases with increasing irradiation intensity. The phone volume can be adjusted with the R23 potentiometer.
All parts of the indicator, except for photoresistors, are mounted on a 128x74 mm board made of getinax or fiberglass. The photoresistors are located on the front side of the indicator housing and are tightly closed by an infrared filter (visible light should not penetrate to the photoresistors at all). As a filter, you can use a plate of getinax or textolite with a thickness of 0,6-0,8 mm.
The indicator housing is made of opaque material (ebonite, getinax, etc.). The indicator is placed in a pocket or hung on a shoulder strap. The indicator is powered by the Krona battery.
Author: S. Vorobev
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