Irradiation of dosimeters and samples to specified doses
Traceable irradiation of dosimeters and samples using gamma and electron beam sources
We provide controlled irradiation of dosimeters and samples to specified absorbed doses using a range of gamma and electron beam irradiation facilities, supporting dosimetry calibration, verification, method development and application-specific studies. Irradiations are performed under well-defined and traceable conditions in collaboration with selected industrial facilities:
Co-60 gamma cell irradiation
For Risø HDRL cobalt-60 gamma sources, dose rates are traceable to national standards at the National Physical Laboratory (NPL), UK. Multiple irradiation geometries and dose-rate ranges are available, with defined irradiation volumes and optional temperature control depending on the facility.
Co-60 free field irradiation
The medical cobalt-60 irradiator (Terabalt T100) provides a fixed horizontal beam with selectable field sizes and a typical dose rate of approximately 1 Gy/min at 100 cm. The facility is used for irradiation of ionization chambers, dosimeters and samples under reproducible reference conditions, with accurate positioning using a motorized XYZ stage.
High-Energy Electron Beam Irradiation – 10 MeV
For high-energy electron irradiations, Risø HDRL collaborates with the industrial 10 MeV electron beam facility at Sterigenics (Denmark). Irradiation is performed using a Rhodotron accelerator, suitable for irradiation of dosimeters and samples up to industrial-scale dimensions. Dosimetry and irradiation procedures follow ISO/ASTM 51649.
Low-Energy (70 keV - 200 keV) Electron Beam Irradiation
Risø HDRL operates a low-energy electron accelerator for irradiation of dosimeters and samples at energies between 70 and 200 keV. The facility supports surface and near-surface irradiation studies under controlled conditions and is operated in accordance with ISO/ASTM 51818 and relevant international guidance.
Medical Linear Accelerator Irradiation
Irradiation can also be performed using a medical linear accelerator (Varian TrueBeam) operated exclusively for non-clinical dosimetry work at DTU Health Tech. The accelerator provides MV photon beams (4–18 MV, including FFF) and electron beams (6–20 MeV) and has high-precision positioning.
For more information contact:
Arne Miller Specialist Consultant Department of Health Technology Phone: +45 46774224 Mobile: 2132 5613 armi@dtu.dk
Christina Ankjærgaard Head of Dosimetry, senior researcher Department of Health Technology Mobile: +45 61656929 cank@dtu.dk
