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The thermal defect of A-150 plastic and graphite for low-energy protons.

The thermal defect of A-150 plastic and graphite for low-energy protons.

Physics in medicine and biology (1990-11-01)

R J Schulz, N Venkataramanan, M S Huq

ABSTRACT

The thermal defects of A-150 plastic and graphite referenced to aluminium were determined for 800 keV protons scattered by a 2 micron nickel foil (mean transmitted energy = 550 keV). Composite cores of Al/A-150, graphite/A-150 and Al/graphite which could be irradiated from one side or the other were employed. The temperature increase of a core caused by 30-100 s of irradiation (3-6 nA of proton beam current) was detected by two thermistors mounted in opposite legs of a Wheatstone bridge. The thermal defect of A-150 plastic was determined to be 0.0421 +/- 0.0036 (SE) referenced to aluminium and 0.0402 +/- 0.0034 referenced to graphite. The thermal defect of graphite referenced to aluminium is 0.0043 +/- 0.0034. No change in the thermal defect of A-150 plastic was detected for accumulated doses up to 8 x 10(5) Gy.

MATERIALS

Product Number

Brand

Product Description

Nickel, foil, not light tested, 100x100mm, thickness 0.004mm, hard, 99%

Nickel, foil, light tested, 25x25mm, thickness 0.009mm, 99.95%

Nickel, foil, not light tested, 25x25mm, thickness 0.001mm, 99.95%

Nickel, foil, not light tested, 100x100mm, thickness 0.002mm, 99.95%

Nickel, foil, not light tested, 25x25mm, thickness 0.0005mm, temporary acrylic support, 99.95%

Nickel, foil, light tested, 100x100mm, thickness 0.007mm, 99.95%

Nickel, foil, 4mm disks, thickness 0.009mm, 99.95%

Nickel, foil, 0.5m coil, thickness 0.0075mm, 99.9%

Nickel, foil, not light tested, 25x25mm, thickness 0.003mm, 99.95%

Nickel, foil, 25x25mm, thickness 0.30mm, as rolled, 99.98%

Nickel, foil, light tested, 50x50mm, thickness 0.05mm, 99.9%

Nickel, foil, light tested, 300x300mm, thickness 0.03mm, 99.9%

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

Nickel, foil, 8mm disks, thickness 0.15mm, annealed, 99%

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

Nickel, foil, 10mm disks, thickness 0.05mm, as rolled, 99.99+%

Nickel, foil, 1m coil, thickness 0.25mm, annealed, 99%

Nickel, foil, 1m coil, thickness 0.02mm, 99.9%

Nickel, foil, 10mm disks, thickness 0.125mm, as rolled, 100%

Nickel, foil, 8mm disks, thickness 0.03mm, 99.9%

Nickel, foil, light tested, 25x25mm, thickness 0.05mm, as rolled, 99.98%

Nickel, foil, light tested, 100x100mm, thickness 0.025mm, 99.9%

Nickel, foil, 100x100mm, thickness 0.125mm, as rolled, 99.999%

Nickel, foil, 8mm disks, thickness 0.125mm, annealed, 99.98%

Nickel, foil, 25mm disks, thickness 0.25mm, annealed, 99.98%

Nickel, foil, light tested, 100x100mm, thickness 0.038mm, 99.9%

Nickel, foil, 100x100mm, thickness 0.25mm, annealed, 99.98%

Nickel, foil, 8mm disks, thickness 0.30mm, as rolled, 99.98%

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

Nickel, foil, 8mm disks, thickness 0.05mm, 99.9%