论文信息 - Scattered Radiation in a Water Phantom Irradiated by Roentgen Photons between 50 and 250 keV

Scattered Radiation in a Water Phantom Irradiated by Roentgen Photons between 50 and 250 keV

Multiple scattering occurs when roentgen photons of therapeutic or diagnostic quality enter a low atomic medium such as water so that, at a given point, secondary or scattered photons in addition to the primary photons from the radiation source are present. This increase in the number of photons within the scattering medium is called the 'build-up'. It would be useful to know the angular and spectral distribution of these additional photons, but as yet only few data are available. BRUCE and JOHNS (1) gave a report on Monte Carlo calculations of spectra of scattered radiation produced in water by radiation of roentgenologic quality. Attempts have been made to measure spectra of scattered radiadiation with a scintillation spectrometer. CORMACK et coll. (3) measured scattered 400 kV radiation in a water phantom, an investigation which was recently followed by another with 280 kV radiation (4); further work with 140 kV radiation is in progress (5). JOHNS and SKARSGARD (13) have published a preliminary report on the same subject. HETTINGER and STARFELT (11), in our group have measured the energy and angular

G. Hettinger | K. Lidén

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