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

GF29590690

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

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%

GF04277729

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

GF94704644

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

GF06331047

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

GF24434748

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

GF83950027

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

GF04295538

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

GF56607341

Indium, foil, not light tested, 25x25mm, thickness 0.0025mm, 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%

GF97485823

Indium, foil, not light tested, 100x100mm, thickness 0.008mm, temporary acrylic support, 99.8%

GF40183950

Indium, foil, 8mm disks, thickness 0.025mm, 99.8%

GF98837319

Indium, foil, 8mm disks, thickness 0.075mm, as rolled, 100%

GF73195038

Indium, foil, not light tested, 25x25mm, thickness 0.002mm, temporary acrylic support, 99.8%

GF12678127

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

GF44006712

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

GF20336149

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

GF39812137

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

GF70986864

Indium, foil, not light tested, 50x50mm, thickness 0.009mm, temporary acrylic support, 99.8%

GF53164650

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

GF21569373

Indium, foil, not light tested, 100x100mm, thickness 0.0125mm, temporary acrylic support, 99.8%

GF10892404

Indium, foil, not light tested, 50x50mm, thickness 0.015mm, 99.8%

GF00838997

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

GF92066496

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