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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 0.01mm, 99.95%
Nickel, foil, 50mm disks, thickness 0.05mm, annealed, 99%
Nickel, foil, 4mm disks, thickness 0.075mm, annealed, 99%
Nickel, foil, 4mm disks, thickness 0.075mm, as rolled, 99.98%
Nickel, foil, 4mm disks, thickness 0.125mm, annealed, 99%
Nickel, foil, 4mm disks, thickness 0.125mm, annealed, 99.98%
Nickel, foil, 4mm disks, thickness 0.125mm, as rolled, 100%
Nickel, foil, 4mm disks, thickness 0.125mm, as rolled, 99.99+%
Nickel, foil, 4mm disks, thickness 0.15mm, annealed, 99%
Nickel, foil, 4mm disks, thickness 0.1mm, annealed, 99%
Nickel, foil, 4mm disks, thickness 0.20mm, annealed, 99%
Nickel, foil, 4mm disks, thickness 0.25mm, annealed, 99%
Nickel, foil, 4mm disks, thickness 0.25mm, annealed, 99.98%
Nickel, foil, 4mm disks, thickness 0.25mm, as rolled, 100%
Nickel, foil, 4mm disks, thickness 0.25mm, as rolled, 99.99+%
Nickel, foil, 4mm disks, thickness 0.30mm, as rolled, 99.98%
Nickel, foil, 4mm disks, thickness 0.3mm, annealed, 99%
Nickel, foil, 4mm disks, thickness 0.3mm, as rolled, 100%
Nickel, foil, 4mm disks, thickness 0.50mm, annealed, 99%
Nickel, foil, 4mm disks, thickness 0.5mm, annealed, 99.98%
Nickel, foil, 4mm disks, thickness 0.5mm, as rolled, 100%
Nickel, foil, 4mm disks, thickness 0.5mm, as rolled, 99.99+%
Nickel, foil, 50mm disks, thickness 0.0025mm, 99.95%
Nickel, foil, 50mm disks, thickness 0.003mm, 99.95%
Nickel, foil, 50mm disks, thickness 0.005mm, as rolled, 99.9%
Nickel, foil, 50mm disks, thickness 0.0075mm, 99.9%
Nickel, foil, 50mm disks, thickness 0.0075mm, 99.95%
Nickel, foil, 50mm disks, thickness 0.0125mm, 99.9%
Nickel, foil, 50mm disks, thickness 0.0125mm, 99.99+%
Nickel, foil, 50mm disks, thickness 0.0125mm, annealed, 99%