Abstract
The performance of Red 4034 Perspex dosemeters from Harwell Technologies in routine photon dosimetry in mixed fields was evaluated. The dosemeters were irradiated in core grid positions of the Portuguese Research Reactor under a photon dose rate of the order of 10 4 Gy / h , a thermal neutron flux in the range of 1.8 × 10 10 to 1.1 × 10 11 n / cm 2 / s and temperatures below 40 ∘ C . The dosemeters visibly darken upon irradiation and this effect, accurately measurable by spectrophotometry, is related to absorbed dose. Thermoluminescence dosemeters and a calibrated ionization chamber were used as comparison. The results show that Red 4034 Perspex is a suitable dosemeter for mixed-field dosimetry up to 50 kGy .
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