A Geiger-Muller tube with a filter for spatial-energy formation of sensitivity, which
converts gamma radiation quanta to electric pulses, is used as a radiation detector. The
detector has a high-voltage power supply.
The microprocessor controls the dosimeter’s operating modes, backlight device,
audible alarm device, infrared communication channel, LCD, non-volatile memory, high-
voltage power supply of the detector, operates the control buttons, performs all the
necessary calculations, self-diagnostics.
The dosimeter’s operating algorithm ensures continuity of the measurement process,
statistical processing of the measurement results, a prompt adaptation to the variation of
level of the gamma radiation dose rate (setting the time of measurement in inverse
dependence on the dose rate) and effective output of the information obtained to the LCD.
The IR-communication channel provides an exchange of information with PC.
The dosimeter has an internal non-volatile memory that allows the information
accumulation and storage.
The dosimeter’s non-volatile memory ensures storage of the following parameters when
replacing the battery for the moment of the battery’s removal:
- accumulated dose (DE);
- DE accumulation time;
- DE and DER accumulation history;
- the preset DER and DE thresholds.
The dosimeter performs continuous DER and DE measurement, DE accumulation
time counting in all modes, excluding an active mode of data transmission to PC (on/Ir).
1.4.2 The dosimeter is designed as a unit housed in a wrist shock-proof case. General
overview of the dosimeter and its parts are shown in Figure 1.2. Indication elements,
positions 1-4, are there on the LCD (8).
1 – DER analog scale (seven segments) for effective control over radiation situation;
2 – LCD area, which indicates:
- DER in DER indication mode;
- DE in DE indication mode;
- year of production in the dosimeter’s number indication mode;
- IR communication channel switch on/off in the PC communication mode;
- “AL” symbol in “alarm clock” mode;
- “TR” symbol in “timer” mode;
- “ST” symbol in “ stop-watch ” mode;
3 – LCD area, which indicates the seconds of the current time or the coefficient of variation
in DER indication mode, DE accumulation time in thousands of hours (h) in DE indication
mode, month of production in the dosimeter’s number indication mode;
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