In 2023, the individual monitoring of worker exposure in industrial activities leading to exposure to substances of natural origin or to radon of geological origin (exposure to natural radionuclides of the uranium and thorium decay chains) involved about 817 workers monitored for external exposure (including 28 workers exposed to more than 1 mSv) and 332 workers monitored for internal exposure (of whom 19 were exposed to more than 1 mSv). Flight crew exposure to cosmic radiation Airline flight crews and certain frequent flyers are exposed to significant doses owing to the altitude and the intensity of cosmic radiation at high altitude. These doses can exceed 1 mSv/year. Since 1 July 2014, IRSN calculates the individual doses for civil flight personnel using the SievertPN application, on the basis of the flight and personnel presence data provided by the airlines. These data are subsequently transmitted to Siseri, the French national worker dosimetry registry. In 2023, the headcount for civil flight personnel totalled 21,585, a figure that is down by 2%. The average dose for this category of personnel has fallen by nearly 15% compared with 2022 (1.2 mSv). About 39% of the individual annual doses are below 1 mSv and 61% of the individual annual doses are between 1 mSv and 5 mSv. The collective dose has decreased by 11% compared with 2022. DIAGRAM 2 Changes in the number of monitored workers whose annual dose exceeds 20 mSv, from 1996 to 2023 0 100 200 300 400 500 600 700 800 900 1,000 905 340 322 177 69 112 79 100 51 40 26 22 16 14 14 14 9 10 5 6 5 5 1 8 2 1 2 8 8 9 8 2 1 2 10 5 Source: IRSN. 5 1 6 5 Details for the 2012-2023 period 0 3 6 9 12 15 2022 2023 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2022 2023 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 Results of dosimetry monitoring of work external exposure to ionising radiation (exposure to natural radioactivity included) in 2023 (Source: Radiation protection of workers: occupational exposure to ionising radiation in France, results for 2023 – IRSN, June 2024) • Total population monitored: 360,743 workers • Monitored population for whom the annual effective dose remained below the detection threshold: 271,708 workers, i.e. 75.3% • Monitored population for whom the annual effective dose remained between the detection threshold and 1 mSv: 62,589 workers, i.e. about 17.3% • Monitored population for whom the annual effective dose remained between 1 mSv and 20 mSv: 26,446 workers, i.e. about 7.3% of the total population monitored • Monitored population for whom the annual effective dose exceeded 20 mSv: 5 workers(*) • Monitored population for whom the equivalent dose to the extremities exceeded 500 mSv: 1 worker • Monitored population for whom the equivalent dose to the extremities exceeded 500 mSv: 3 workers(**) • Monitored population for whom the equivalent dose to the lens of the eye exceeded 20 mSv: 1 worker • Collective dose (sum of the individual effective annual doses): 84.2 man-Sv • Average annual individual effective dose in the population which recorded a dose higher than the detection threshold: about 0.95 mSv Results of internal exposure monitoring in 2023 (natural radioactivity excluded) • Number of routine examinations carried out: 238,738 (of which 0.6% were considered positive) • Number of workers with a positive result (routine monitoring): 785 • Number of special monitoring examinations: 9,098 (of which 16.6% are above the detection limit) • Population having recorded a committed effective dose exceeding 1 mSv: 4 workers Results of monitoring of internal exposure to natural radionuclides, excluding “geogenic” radon and its daughter products, in 2023 • Internal exposure: – collective dose for 302 workers: 58.93 man-mSv – average annual individual dose for the population having registered a dose above the detection limit: 0.32 mSv * One of these cases was detected in August 2023 for a cumulative dose of 25.9 mSv over 12 sliding months from June 2022 to May 2023, and not over the calendar year; four of these cases were retained by default as the occupational physician gave no feedback on the conclusions of the investigation. ** Two cases were not confirmed by the occupational physician. ASN Report on the state of nuclear safety and radiation protection in France in 2024 109 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 AP Nuclear activities: ionising radiation and health and environmental risks
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