engleski

Total Occupational and Possible Public Member Exposure during Characterisation, Conditioning and Securing of Radioactive Sealed Sources – A New Dosimetric Concept Using Active Electronic Dosimeters

Radiation dosimetry in protection against ionizing radiation involves research of all possible pathways through which natural or man-made radioactive materials can contaminate a habitat and actually harm its biota. It also takes into account natural and artificial (man-made) electromagnetic ionizing radiation (gama and X radiation). The purpose of conducted study was to validate a new active electronic dosimeter (AED) of type ALARA OD and to develop a new monitoring method by tracing the possible external occupational and/or public exposure over real time. This method is used to continuously measure and record external radiation doses. A novelty is establishing dose rates receiving pattern as a function of real time. This article presents a dosimetric study assessing exposure to man-made ionizing radiation of local environment and total occupational exposure of two professional workers involved in characterization, conditioning, and securing of unused radioactive sealed sources. Occupational whole body dosimetric results obtained with AED were compared with results obtained with passive dosimetry (film badge and thermoluminiscence). Air, dust, and silicon sand samples were analyzed by gamma-spectrometry to estimate internal exposure of the two workers to 222Rn due to inhalation or ingestion of dust and sand in indoor air. In order to establish total occupational exposure control radon measurement was performed in the immediate environment. The set of quantities describing possible hazard due to exposure of a public member to radionuclides with activity concentrations contributing the LBG and the external and internal Hazard index (Hex, Hint) were calculated and brought to discussion.

AED; ALARA; effective dose; electronic dosimetry; hazard index; Hp(10); low level

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