Aspects of harmonisation of individual monitoring for external radiation in Europe: Conclusions of a EURADOS action

Following the publication of the EU Council Directive 96/29, EURADOS coordinated two working groups (WGs) for promoting the process of harmonisation on individual monitoring of occupationally exposed persons in Europe. An overview of the major findings of the second WG is presented. Information on the technical and quality standards and on the accreditation and approval procedures has been compiled. The catalogue of dosimetric services has been updated and extended. An overview of national regulations and standards for protection from radon and other natural sources in workplaces has been made, attempting to combine the results from individual monitoring for external, internal and workplace monitoring. A first status description of the active personal dosemeters, including legislative and technical information, and their implementation has been made. The importance of practical factors on the uncertainty in the dose measurement has been estimated. Even if a big progress has been made towards harmonisation, there is still work to be don

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Individual monitoring with BeOSL dosemeters: New dosemeters for extremity and area dosimetry.

To extend the applications of BeOSL technology beyond whole body dosimetry, three new dosemeters were developed: an eye lens dosemeter and a finger ring dosemeter using a single BeOSL detector element and a two-element area dosemeter for work place monitoring. This work describes the new dosemeters, provides data from the radiological characterization of the dosemeters according to IEC 62387 and addresses the issue of measurement uncertainty and detection limits achievable with the BeOSL systems. The response of the new extremity dosemeters in terms of H-p(3) and H-p(0,07) with respect to photon energy and angle of incidence fulfills the IEC 62387 requirements. The area dosemeter fulfills the IEC requirements for workplace monitoring but not the more stringent requirements for environmental dosimetry, due to an under-response for angles of incidence larger than 60 degrees. The results of an uncertainty analysis for the dose evaluation of single element dosemeters show that detection limits in the range of 26 mu Sv-43 mu Sv can be achieved if dedicated background dosemeters are used

New eye lens dosemeters for integration in radiation protection glasses.

With the annual dose limit for the lens of the eye being lowered to 20 mSv from 2019, both new efforts to improve radiation protection for this part of the body and new approved dosemeters for official dose monitoring are required. The individual monitoring services at the Helmholtz Zentrum Miinchen and Dosilab AG, together with MAVIG, have developed a mechanical interface to integrate eye lens dosemeters into radiation protection glasses. MAVIG has designed a new type of radiation protection glasses featuring this dosemeter interface. The two individual monitoring services have independently developed two new types of eye lens dosemeters for the interface. The Munich solution for the eye lens dosemeter is a BeOSL dosemeter for photon radiation with a new detector element introduced by Dosimetrics GmbH in 2018. The Dosilab approach is based on a TLD dosemeter for photon and beta radiation. This work describes the concepts for radiation protection glasses and interface, the new dosemeters, and presents the performance characteristics of the dosemeters in accordance with IEC requirements

A BeOSL finger ring dosemeter.

The Individual Monitoring Service (IMS) at the Helmholtz Zentrum Miinchen together with Dosimetrics GmbH has developed and characterized a new ring dosemeter for photon radiation for the measurement of H-p(0,07), based on BeOSL technology. This work describes the new finger ring dosemeter and provides data from Monte Carlo simulation and from the radiological characterization of the dosemeters according to IEC 62387, such as the energy and angular response functions of the dosemeter, its dose linearity and the coefficient of variation. Furthermore, the opacity of the dosemeter enclosure and light conditions for packing and unpacking of the detectors are addressed

Performance of the BeOSL eye lens dosemeter with radiation protection glasses.

A new BeOSL eye lens dosemeter for integration in radiation protection glasses has been investigated in laboratory tests on an Alderson head phantom. Several dosemeter positions on an unshielded Alderson phantom were exposed in the primary x-ray beam. They were then compared to dosemeters shielded by radiation protection glasses, including a new model (MAVIG BR330) featuring a mechanical interface for the dosemeter. Primary goals were to evaluate the dose reduction for several types of glasses and geometries, as well as to confirm optimal dosemeter position for evaluation of the dose to the eye lens. Results show that radiation protection glasses lower the dose to the eye lens and thus should be worn at all times. Furthermore, they confirm the choice of the measuring position behind the lateral shielding next to the eye closer to the radiation source. However, we also show that small changes in geometry can have a large effect on both dosimetry and protection properties of the glasses. Finally, the results are extended to a wider energy range with data from Monte Carlo Simulations