Recalibration of indium foil for personnel screening in criticality accidents.

Recalibration of indium foil for personnel screening in criticality accidents.

Radiation protection dosimetry (2010-11-11)

C Takada, N Tsujimura, S Mikami

ABSTRACT

At the Nuclear Fuel Cycle Engineering Laboratories of the Japan Atomic Energy Agency (JAEA), small pieces of indium foil incorporated into personal dosemeters have been used for personnel screening in criticality accidents. Irradiation tests of the badges were performed using the SILENE reactor to verify the calibration of the indium activation that had been made in the 1980s and to recalibrate them for simulated criticalities that would be the most likely to occur in the solution process line. In addition, Monte Carlo calculations of the indium activation using the badge model were also made to complement the spectral dependence. The results lead to a screening level of 15 kcpm being determined that corresponds to a total dose of 0.25 Gy, which is also applicable in posterior-anterior exposure. The recalibration based on the latest study will provide a sounder basis for the screening procedure in the event of a criticality accident.

MATERIALS

Product Number

Brand

Product Description

GF64284284

Indium, foil, 6mm disks, thickness 0.05mm, as rolled, 100%

GF29590690

Indium, foil, 6mm disks, thickness 0.075mm, as rolled, 100%

GF59518491

Indium, foil, 6mm disks, thickness 0.125mm, as rolled, 100%

GF47226191

Indium, foil, not light tested, 25x25mm, thickness 0.007mm, temporary acrylic support, 99.8%

GF62573395

Indium, foil, light tested, 50x50mm, thickness 0.075mm, as rolled, 100%

GF82494557

Indium, foil, not light tested, 100x100mm, thickness 0.015mm, 99.8%

GF87394652

Indium, foil, not light tested, 50x50mm, thickness 0.01mm, 99.8%

GF06331047

Indium, foil, 8mm disks, thickness 0.04mm, 99.8%

GF28933858

Indium, foil, not light tested, 25x25mm, thickness 0.025mm, 99.8%

GF24434748

Indium, foil, light tested, 100x100mm, thickness 0.075mm, as rolled, 100%

GF88051114

Indium, foil, not light tested, 50x50mm, thickness 0.003mm, temporary acrylic support, 99.8%

GF99016487

Indium, foil, not light tested, 50x50mm, thickness 0.008mm, temporary acrylic support, 99.8%

GF85401918

Indium, foil, 8mm disks, thickness 0.01mm, 99.8%

GF12014053

Indium, foil, not light tested, 100x100mm, thickness 0.01mm, 99.8%

GF08711052

Indium, foil, not light tested, 50x50mm, thickness 0.025mm, 99.8%

GF97552941

Indium, foil, not light tested, 25x25mm, thickness 0.009mm, temporary acrylic support, 99.8%

GF38080065

Indium, foil, 8mm disks, thickness 0.25mm, as rolled, 100%

GF37873738

Indium, foil, not light tested, 25x25mm, thickness 0.02mm, 99.8%

GF11864932

Indium, foil, not light tested, 25x25mm, thickness 0.006mm, temporary acrylic support, 99.8%

GF62925138

Indium, foil, not light tested, 50x50mm, thickness 0.004mm, temporary acrylic support, 99.8%

GF41231797

Indium, foil, not light tested, 50x50mm, thickness 0.02mm, 99.8%

GF19313030

Indium, foil, not light tested, 25x25mm, thickness 0.0125mm, temporary acrylic support, 99.8%

GF50338436

Indium, foil, not light tested, 50x50mm, thickness 0.03mm, 99.8%

GF97195595

Indium, foil, not light tested, 50x50mm, thickness 0.0025mm, temporary acrylic support, 99.8%

GF94704644

Indium, foil, 6mm disks, thickness 0.25mm, as rolled, 100%

GF44622086

Indium, foil, not light tested, 25x25mm, thickness 0.015mm, 99.8%

GF53164650

Indium, foil, not light tested, 25x25mm, thickness 0.003mm, temporary acrylic support, 99.8%

GF55033589

Indium, foil, 8mm disks, thickness 0.75mm, as rolled, 100%

GF35535157

Indium, foil, 8mm disks, thickness 0.05mm, as rolled, 100%

GF61338966

Indium, foil, light tested, 25x25mm, thickness 0.05mm, as rolled, 100%