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Photoactivation ratios for specification of high-energy x-ray quality: part II, 4-15-MV x rays.

Photoactivation ratios for specification of high-energy x-ray quality: part II, 4-15-MV x rays.

Medical physics (1977-01-01)

R J Schulz, R Nath

RESUMO

A sensitive and relatively simple method for obtaining an index of the spectral quality of x rays in the 4-15-MV range is presented. The method is based upon the simultaneous production of 115mIn by inelastic scattering of x rays by an indium foil and the production of 116mIn by neutron capture, where the neutrons are obtained from the photodisintegration of deuterium. Since the cross sections for the production of 115mIn and 116mIn have markedly different energy response functions, the ratio of radioactivities is very sensitive to the incident x-ray spectrum. Using a detector consisting of an indium foil sandwiched between two plastic bottles of D2O, photoactivation ratios (PAR) have been measured for 4-, 6-, and 10-MV x rays. It is shown that the PAR method offers a sensitive and practical means for quality control of x-ray spectra and comparison of high-energy accelerators.

MATERIAIS

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

Indium, foil, 100x100mm, thickness 0.25mm, as rolled, 99.999%

Indium, foil, 50x100mm, thickness 0.1mm, as rolled, 100%

Indium, foil, 100x100mm, thickness 0.20mm, as rolled, 99.999%

Indium, foil, 10mm disks, thickness 0.75mm, as rolled, 100%

Indium, foil, 50x50mm, thickness 0.25mm, as rolled, 99.999%

Indium, foil, 100x100mm, thickness 0.1mm, as rolled, 100%

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

Indium, foil, 25x25mm, thickness 0.125mm, as rolled, 99.999%

Indium, foil, 25x25mm, thickness 0.25mm, as rolled, 99.999%

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

Indium, foil, 100x100mm, thickness 0.5mm, as rolled, 99.999%

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

Indium, foil, 100x100mm, thickness 0.75mm, as rolled, 99.999%

Indium, foil, 100x200mm, thickness 0.5mm, as rolled, 99.999%

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

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

Indium, foil, not light tested, 50x50mm, thickness 0.04mm, 99.8%

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

Indium, foil, 25x25mm, thickness 0.20mm, as rolled, 99.999%

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

Indium, foil, 150x150mm, thickness 0.1mm, as rolled, 100%

Indium, foil, 50x50mm, thickness 1.0mm, as rolled, 99.999%

Indium, foil, 10mm disks, thickness 0.02mm, 99.8%

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

Indium, foil, 15mm disks, thickness 0.02mm, 99.8%

Indium, foil, 6mm disks, thickness 0.125mm, as rolled, 100%

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

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

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