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

GF76326396

Indium, foil, 8mm disks, thickness 0.03mm, 99.8%

GF12014053

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

GF35535157

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

GF61338966

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

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%

GF93752590

Indium, foil, 8mm disks, thickness 0.5mm, as rolled, 100%

GF29634228

Indium, foil, 6mm disks, thickness 0.1mm, as rolled, 100%

GF89773138

Indium, foil, 8mm disks, thickness 0.02mm, 99.8%

GF34180758

Indium, foil, not light tested, 100x100mm, thickness 0.009mm, temporary acrylic support, 99.8%

GF55033589

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

GF22451420

Indium, foil, not light tested, 25x25mm, thickness 0.04mm, 99.8%

GF19585996

Indium, foil, not light tested, 50x50mm, thickness 0.006mm, temporary acrylic support, 99.8%

GF69902084

Indium, foil, not light tested, 50x50mm, thickness 0.04mm, 99.8%

GF50265918

Indium, foil, not light tested, 25x25mm, thickness 0.01mm, 99.8%

GF99538600

Indium, foil, not light tested, 50x50mm, thickness 0.007mm, temporary acrylic support, 99.8%

GF08164380

Indium, foil, not light tested, 50x50mm, thickness 0.0125mm, temporary acrylic support, 99.8%

GF88051114

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

GF97552941

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

GF87394652

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

GF50338436

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

GF29953402

Indium, foil, 25x25mm, thickness 3.0mm, as rolled, 99.999%

GF85273577

Indium, foil, 50x100mm, thickness 0.1mm, as rolled, 100%

GF44622086

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

GF59518491

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

GF74341278

Indium, foil, 6mm disks, thickness 0.20mm, as rolled, 100%

GF07860900

Indium, foil, light tested, 50x50mm, thickness 0.05mm, as rolled, 100%

GF11864932

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

GF58678958

Indium, foil, 6mm disks, thickness 0.75mm, as rolled, 100%

GF40478508

Indium, foil, not light tested, 100x100mm, thickness 0.03mm, 99.8%