Pii: S1350-4487(98)00072-9
نویسندگان
چکیده
ÐMeasurement of lepton contamination is achieved across a radiotherapy photon beam and peripheral doses using radiochromic ®lm. An extrapolation technique is used where several layers are suspended in air to measure incident contamination without the eects of phantom scatter. Surface dose was measured as 11% of Dmax for 6 MV beams at central axis and 9% for 10 MV photons for a 10 10 cm ®eld size. Peripheral lepton doses were found to decrease compared to central, however, were still measurable. Peripheral lepton dose was found to increase with ®eld size and was 12% and 15%, 2 cm outside the geometric ®eld edge of a 30 30 cm ®eld size at 6 and 10 MV respectively. Radiochromic ®lm is a suitable dosimeter for measurement of lepton contamination absorbed dose to surface layers of skin. # 1998 Elsevier Science Ltd. All rights reserved
منابع مشابه
Pii: S1350-9462(98)00037-8
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متن کاملPii: S1350-9462(00)00026-4
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متن کاملPii: S1350-9462(00)00024-0
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متن کاملPii: S1350-4533(97)00020-9
Apparatus has been built to explore the practical feasibility of using automatic control with electrical stimulation of paralysed legs to restore function. The experiments are performed with paraplegics with the aim of achieving a realistic postural task: to see whether the body may be maintained upright by stimulation of the plantarflexors when the other joints are braced. Significantly, the i...
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