Reduced output of orthovoltage radiotherapy units.

Medical physics (1976-03-01)
C K Bomford
ABSTRACT

Three causes of reduced output of orthovoltage radiotherapy units have recently been reported in this journal, each being due to faults external to the tube insert. A further incident is now reported where the output was reduced by 30% due to the tungsten foil becoming partially detached from the anode, while the unit continued to operate normally. The possible cause and the prevention of a repeat occurrence are discussed.

MATERIALS
Product Number
Brand
Product Description

Tungsten, foil, light tested, 100x100mm, thickness 0.05mm, as rolled, 99.95%
Tungsten, foil, 100x100mm, thickness 0.125mm, as rolled, 99.95%
Tungsten, foil, 100x100mm, thickness 0.15mm, as rolled, 99.95%
Tungsten, foil, 100x100mm, thickness 0.1mm, as rolled, 99.95%
Tungsten, foil, 100x100mm, thickness 0.2mm, as rolled, 99.95%
Tungsten, foil, 100x100mm, thickness 0.3mm, as rolled, 99.95%
Tungsten, foil, 100x100mm, thickness 0.5mm, as rolled, 99.95%
Tungsten, foil, 100x100mm, thickness 1.0mm, as rolled, 99.95%
Tungsten, foil, 100x100mm, thickness 2.0mm, as rolled, 99.95%
Tungsten, foil, 150x150mm, thickness 0.125mm, as rolled, 99.95%
Tungsten, foil, 150x150mm, thickness 0.15mm, as rolled, 99.95%
Tungsten, foil, 150x150mm, thickness 0.1mm, as rolled, 99.95%
Tungsten, foil, 150x150mm, thickness 0.5mm, as rolled, 99.95%
Tungsten, foil, 150x150mm, thickness 1.0mm, as rolled, 99.95%
Tungsten, foil, 200x200mm, thickness 0.15mm, as rolled, 99.95%
Tungsten, foil, 200x200mm, thickness 0.1mm, as rolled, 99.95%
Tungsten, foil, 200x200mm, thickness 0.2mm, as rolled, 99.95%
Tungsten, foil, 50x50mm, thickness 0.125mm, as rolled, 99.95%
Tungsten, foil, 50x50mm, thickness 0.15mm, as rolled, 99.95%
Tungsten, foil, 50x50mm, thickness 0.1mm, as rolled, 99.95%
Tungsten, foil, 50x50mm, thickness 0.2mm, as rolled, 99.95%
Tungsten, foil, 50x50mm, thickness 0.3mm, as rolled, 99.95%
Tungsten, foil, 50x50mm, thickness 0.5mm, as rolled, 99.95%
Tungsten, foil, 50x50mm, thickness 1.0mm, as rolled, 99.95%
Tungsten, foil, 50x50mm, thickness 2.0mm, as rolled, 99.95%
Tungsten, foil, 50x50mm, thickness 3.0mm, as rolled, 99.95%
Tungsten, foil, 0.1m coil, thickness 0.076mm, coil width 2mm, as rolled, 99.95%
Tungsten, foil, 0.2m coil, thickness 0.016mm, coil width .36mm, as rolled, 99.95%
Tungsten, foil, 0.2m coil, thickness 0.025mm, coil width .7mm, as rolled, 99.95%
Tungsten, foil, 0.2m coil, thickness 0.025mm, coil width 1mm, as rolled, 99.95%