Dosimetry monitoring is the measurement of the magnitude (or power) of the dose of ionizing radiation in order to establish the level of doses received by persons in contact with sources of radiation. It is carried out in radiological rooms, radiological laboratories, at the enterprises of the nuclear industry, as well as at sites of radioactive contamination. Dosimetric monitoring is carried out with the help of special devices - dosimeters (see Dosimeters of ionizing radiation).
Dosimetry control is carried out in two ways. In the first method (group dosimetry), the radiation dose rate is measured at a specific location, for example, in a radiotherapy or gamma- ray control room. Having this information and knowing the residence time of people in the control room, it is easy to calculate the dose of radiation. For example, the radiation dose rate in this room is 10 mrad / hour, and the time of people's stay in it is 5 hours. Consequently, the magnitude of the radiation dose of each is 10x5 = 50 mrad.
In the second measurement method (individual dosimetry), each employee receives an individual dosimeter, which he wears during the whole working day in a breast pocket of a special robe. Individual dosimeters are regularly handed over to the dosimetry laboratory, where the measured radiation dose received by the employee is measured.
Individual dosimeters require careful treatment. After severe shock or shock, the dosimeter must be replaced. After the end of work, the dosimeter should not be left in rooms where the presence of radiation is determined. See also Doses of ionizing radiation.