Dosimetry intercomparison for partial body X-irradiation of rats

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Abstract
An X-ray dosimetry intercomparison for partial body irradiations was performed among a number of laboratories cooperating within EULEP (European Late Effects Project Group) using mailed acrylic plastic rat phantoms. The adequacy of exposure arrangements and dosimetry procedures applied to rat partial body irradiations at the participating institutes were investigated. The dose and dose distribution in lung and liver substitute material were measured with dual thermoluminescent (TL) dosimeters LiF and CaF2:Mn. The doses from scattered radiation in the shielded parts of the phantom were assessed. Dose comparisons show that in the 1st instance 6 of 8 participating institutes had dose values differing by more than 5% from the standard dose. Inconsistencies were observed between the lung and liver doses administered at the same institute. After consultation, 4 institutes indicated the cause for their deviating dose values and quoted revised results which are closer to the standard value. Large dose gradients are measured, since 6 of 8 participants applied unilateral exposures. A need exists for repeated intercomparisons and for improvements in dosimetry and irradiation procedures for partial body irradiations.