The dosimeter DKG-02U “Arbiter” with a wide measurement range and easily decontaminated hermetical case, suitable for operation in severe environment. The dosimeter indicates dose rate and dose (operator’s exposure) that makes it a convenient tool for performing radiation surveys under radiation accident conditions. While performing surveys of territories, buildings or equipment, the user can save measurement results in the dosimeter’s memory, add a comment (for example, name of measurement point) and transfer this information to a personal computer later, after the survey is finished.