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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

Indium, foil, 4mm disks, thickness 0.5mm, as rolled, 100%

Indium, foil, 25mm disks, thickness 0.1mm, as rolled, 100%

Indium, foil, 10mm disks, thickness 1.0mm, as rolled, 100%

Indium, foil, 15mm disks, thickness 0.015mm, 99.8%

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

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

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

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

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

Indium, foil, light tested, 25x25mm, thickness 0.075mm, as rolled, 100%

Indium, foil, 6mm disks, thickness 1.0mm, as rolled, 100%

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

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

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

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

Indium, foil, not light tested, 100x100mm, thickness 0.04mm, 99.8%

Indium, foil, 8mm disks, thickness 0.20mm, as rolled, 100%

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

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

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

Indium, foil, not light tested, 25x25mm, thickness 0.0025mm, temporary acrylic support, 99.8%

Indium, foil, not light tested, 75x150mm, thickness 0.05mm, as rolled, 100%

Indium, foil, 4mm disks, thickness 0.02mm, 99.8%

Indium, foil, 6mm disks, thickness 0.02mm, 99.8%

Indium, foil, 10mm disks, thickness 0.075mm, as rolled, 100%

Indium, foil, 10mm disks, thickness 0.5mm, as rolled, 100%

Indium, foil, not light tested, 150x150mm, thickness 0.075mm, as rolled, 100%

Indium, foil, 4mm disks, thickness 0.75mm, as rolled, 100%

Indium, foil, 15mm disks, thickness 0.01mm, 99.8%

Indium, foil, 6mm disks, thickness 0.03mm, 99.8%