Active dosimeter (electronic) This a device which alerts the user and optimises radiation protection. It provides a continuous display of the dose accrued since the start of the operation and has a visual or audio alarm system with an adjustable triggering threshold. It enables the responders to self-check their radiation protection in hostile environments. It is used in accordance with the instructions of the RPE, who may revise them according to how the situation evolves. The alarm thresholds can be harmonised so that all the responders have the same triggering thresholds. Passive dosimeter These dosimeters are assigned to named individuals and allow an integrated dosimetric measurement during the emergency period. The dosimeter analysis cycle usually takes several days (dispatch to laboratory, analysis, return), but can be expedited if necessary. IRSN holds a permanent stock of several hundred dosimeters which can be issued immediately at the request of the public authorities in the event of a crisis. Generally speaking, the dosimeters used and worn on the chest are suitable for the types of radiation likely to be encountered: X-rays, gamma and/or beta rays, neutrons. Extremity dosimeters and eye lens dosimeters can also be worn if necessary. SEE SHEET 16 EXTERNAL DOSIMETERS FOR THE RESPONDERS MEDICAL RESPONSE STRATEGY Responders’ equipment and means of protection 08 SHEET 06 © Bertin Technologies © APVL ingénierie © Landauaer © Grégoire Maisonneuve/ Médiathèque IRSN MEDICAL RESPONSE IN NUCLEAR OR RADIOLOGICAL EMERGENCY 27
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