Measurements of primary spectra from a kilocurie 60Co unit and a 6 MeV linear accelerator
| Autor: | Jessen Ka |
|---|---|
| Rok vydání: | 1973 |
| Předmět: |
Astrophysics::High Energy Astrophysical Phenomena
Radiation Spectral line Collimated light Radiotherapy High-Energy symbols.namesake Optics Yttrium Isotopes Cesium Isotopes Methods Scattering Radiation Cobalt-60 Cobalt Radioisotopes Technology Radiologic Physics Radioisotopes business.industry Detector Gamma ray Roentgen General Medicine Spectrometry Gamma symbols Radioisotope Teletherapy Nuclear medicine business Intensity (heat transfer) Aluminum |
| Zdroj: | Acta radiologica: therapy, physics, biology. 12(6) |
| ISSN: | 0567-8064 |
| Popis: | Spectral measurements have been made of gamma radiation from a T.E.M. Stabilatron kilocurie cobalt 60 unit and of roentgen radiation from a Varian Clinac 6 MeV linear accelerator with a NaI crystal spectrometer, both units normally used by us for radiation therapy. The high photon flux density from these two types of radiation sources, especially the pulsating radiation from the accelerator, necessitates a reduction in the intensity. This is performed by spreading in A1 foil (SCRIMGER & CORMACK 1963, BENTLEY et coll. 1967, LOFROTH 1970), which reduces both intensity and energy, and by collimation. Multiple counts are reduced by means of a dual delay line amplifier (CHASE & SVELTO 1961 ) . A response matrix (SAM et coll. 1968) for the detector was constructed from the monoenergetic gamma ray source spectra and applied to obtain the gamma ray and roentgen spectra from the measured pulse height distribution. An iterative unfolding procedure ( SKARSGARD et coll. 1961 ) solved the matrix equation |
| Databáze: | OpenAIRE |
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