Abstract
Abstract For more than 25 years, thermoluminescence dosemeters (TLDs) have been used at Research Centre Jülich for the dose determination of photon radiation in environmental monitoring. Dose measurements are performed in six-month exposure intervals at 78 measuring locations in total at the outer fence and some additional locations inside and outside the research centre. Long-term variations in natural background radiation are analysed in comparison with climate data and the local conditions near the measuring locations and discussed with a view to determining the area-specific parameters. Taking the special conditions of Research Centre Jülich into account, the problems relating to the detection limit of 0.1 mSv/a, stipulated in the guideline for the emission and immission monitoring of nuclear facilities, are considered in more detail compared to natural background radiation.
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