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

GF85650644

Indium, foil, 6mm disks, thickness 0.04mm, 99.8%

GF83950027

Indium, foil, 6mm disks, thickness 0.5mm, as rolled, 100%

GF88051114

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

GF12014053

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

GF97552941

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

GF58678958

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

GF62925138

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

GF92066496

Indium, foil, not light tested, 100x100mm, thickness 0.025mm, 99.8%

GF24434748

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

GF41231797

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

GF12678127

Indium, foil, not light tested, 25x25mm, thickness 0.008mm, temporary acrylic support, 99.8%

GF08711052

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

GF20336149

Indium, foil, not light tested, 100x100mm, thickness 0.02mm, 99.8%

GF50338436

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

GF39812137

Indium, foil, 8mm disks, thickness 0.125mm, as rolled, 100%

GF74341278

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

GF19585996

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

GF07860900

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

GF04295538

Indium, foil, 8mm disks, thickness 0.0125mm, temporary acrylic support, 99.8%

GF11864932

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

GF40478508

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

GF50265918

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

GF04277729

Indium, foil, 8mm disks, thickness 0.1mm, as rolled, 100%

GF00838997

Indium, foil, 8mm disks, thickness 1.0mm, as rolled, 100%

GF94704644

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

GF96094873

Indium, foil, not light tested, 100x100mm, thickness 0.006mm, temporary acrylic support, 99.8%

GF99538600

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

GF87572649

Indium, foil, 8mm disks, thickness 0.015mm, 99.8%