Determinations of Ngas and Prepl factors from commercially available parallel-plate chambers: AAPM Task Group 21 protocol.
| Autor: | Kubo H, Kent LJ, Krithivas G |
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| Jazyk: | angličtina |
| Zdroj: | Medical physics [Med Phys] 1986 Nov-Dec; Vol. 13 (6), pp. 908-12. |
| DOI: | 10.1118/1.595968 |
| Abstrakt: | Using a Farmer chamber as a reference dosimeter, we have measured the Ngas (cavity-gas calibration factor) and Prepl (replacement correction factor) values for four parallel-plate chambers: a Holt chamber, a Capintec chamber, a Markus chamber, and an SHM chamber. Ngas determinations were done primarily using 60Co photons and nominal 18-MeV electrons for Ngas determinations. For Prepl determinations, we used nominal 18-, 15-, 12-, 9-, 6-, and 4-MeV electrons. |
| Databáze: | MEDLINE |
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