2 Operation
2.1 Pre-Operation
2.1.1 General
Check the dosimeter’s delivery kit according to 1.2.1 and its functionality according to
2.1.4.
Avoid mechanical shocks and damages, corrosive media, organic solvents, open fire, and
other unfavorable effects.
2.1.2 Safety precautions
2.1.2.1 Observe the radioactive materials handling and radiation safety standards and
regulations during adjustment, repair, maintenance and calibration of the dosimeter, if radioactive
sources are used.
2.1.2.2 Additional safety precautions
In case of radioactive contamination, wipe the body of the dosimeter with and an ethyl
alcohol-saturated tissue to decontaminate the dosimeter. Ethyl alcohol consumption for the
dosimeter decontamination is 50 ml.
2.1.3 Preparation
2.1.3.1 Before operating the dosimeter, review this operation manual thoroughly and retain
it for the future references.
2.1.3.2 Remove the instrument from its package and install the batteries.
2.1.3.3 Installation of the batteries:
Dosimeter is delivered without the batteries. To install the battery unscrew the battery com-
partment’s cover 9 (Figure 1) with a screwdriver or a coin, insert the battery (8), observing the po-
larity (with "+" directed inside the dosimeter), into the battery compartment and fix the battery
compartment’s cover in its place.
Right after inserting the battery, instrument switches on automatically.
2.1.4 Workability checking
Switch on the dosimeter according to 2.2.1. The dosimeter should enter the DER
measurement mode. The LCD displays information (Figure 2.1). The dosimeter is ready for
operation in approximately 60 seconds after power on.
The DER value can be read when the relative root-mean-square uncertainty of the average
reading (hereinafter referred to as “statistical uncertainty” is less than 15 %. The DER value (at
normal radiation background) should be 0.05 to 0.2 µSv/h. The LCD backlight is activated upon
pressing a button. If no button is pressed, the backlight is automatically switched off in
approximately 6, 20 or 60 seconds (as set in the settings mode). If there is no backlight, switch it on
in the settings mode.
Check operation of each mode according to 2.2.3. There should be no error messages during
the functional check.
Switch the dosimeter off according to 2.2.4.
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