Dose intercomparison experiment for gamma rays and 3-MeV electrons by mailing dosimetry using free-radical dosimeters

The high-dose intercomparison experiments between BARC and JAERI for 60Co-γ-rays and 3-MeV electrons were carried out by mailing alanine (powder and alanine-polymer) and glutamine (powder) dosimeters between the two facilities. Powder dosimeters and alanine-polymer dosimeters were read out by spectrophotometry and EPR spectrometry, respectively. Absorbed dose values at about 1, 10, 33 and 54 kGy estimated by these dosimeters were in good agreement with JAERI nominal doses within ±5% both for γ-rays and electrons. This preliminary result shows that these free-radical dosimeters have useful characteristics as mailing dosimeters for regional transfer dose standardization.