Risø HDRL provides accredited calibration and measurement dosimetry services to the radiation processing industry and has actively contributed to this field for more than 50 years. Here, we present new dosimetry application areas, new measurement techniques, and ongoing research:

Dose measurement for low energy x-ray applications:

- Transfusion blood irradiation

- Phytosanitary applications

The response of the alanine dosimeter is energy dependent. Measurement traceability at low energy x-ray is maintained through application of a correction factor that was determined both theoretically and experimentally.

E-beam PQ dose mapping requires measurement of dose at location with great dose gradients. Using Risø B3 film and RisøScan dosimetry system allows traceable sub-mm measurement resolution.

Dose measurement for 80 keV – 200 keV e-beam irradiation. These energies are used for polymer treatment – curing, crosslinking – and for surface decontamination or sterilization in food packaging and pharmaceutical industry. Traceable OQ and PQ dose measurements and calibrations are obtained using the  D_µ - method.  

Calculation of dose distribution using TOPAS with GEANT4 codes. We have developed software using product and material data to generate detailed input files in voxel format. The output is detailed dose distribution in product and monitoring geometry, allowing determination of dose ratios D_min/D_mon and D_max/D_mon.

HDRL actively researches the area of bulk dosimetry in polymer materials for maximum acceptable dose characterization. Part of this research involves investigating the effect of stored charge on the dose in the polymer during e-beam irradiation and conditions leading to electrical discharge.

This poster invites for discussions on these topics and knowledge sharing.