Ionization Build-up in Upper Respiratory Air Passages during Teletherapy with Cobalt 60 Radiation
| Autor: | J. W. McKay, E. R. Epp, M. N. Lougheed |
|---|---|
| Rok vydání: | 1958 |
| Předmět: |
Masonite
Materials science business.industry Respiratory System Cobalt General Medicine Radiation Imaging phantom Body Fluids Radioactivity Optics Mockup visual_art Ionization Ionization chamber visual_art.visual_art_medium Humans Radiology Nuclear Medicine and imaging Irradiation Cobalt Radioisotopes Cobalt-60 business Nuclear medicine |
| Zdroj: | The British Journal of Radiology. 31:361-367 |
| ISSN: | 1748-880X 0007-1285 |
| DOI: | 10.1259/0007-1285-31-367-361 |
| Popis: | An investigation of the status of electron equilibrium at the surface of a lesion located in an air cavity of the upper respiratory system irradiated with cobalt 60 teletherapy has been carried out. The experimental method consisted of measuring the “build-up” of ionization in a small ionization chamber in a masonite phantom. This phantom had an air volume in the shape of a rectangular parallelepiped constructed so that its dimensions could be varied to cover the anatomical range. The photon beam passed through this air volume before reaching the ionization chamber. The departure of the reciprocal of the ionization build-up ratio (BUR)−1 from unity was measured as the dimensions of the irradiating field and of the parallelepiped were varied. For practical cases encountered in radiation therapy this departure is not greater than 10 per cent, but should be accounted for if allowances for increased beam penetration through air are made. |
| Databáze: | OpenAIRE |
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