| Autor: |
G M, Makrigiorgos, J B, Smathers, L T, Myers, S H, Benedict |
| Rok vydání: |
1990 |
| Předmět: |
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| Zdroj: |
Medical physics. 17(1) |
| ISSN: |
0094-2405 |
| Popis: |
The mean quality factor (Q) and the dose mean linear energy transfer [LET (LD)] a few centimeters outside a neutron therapy beam have been measured using a high-pressure ionization chamber. Measurements have been carried out in air, 5 and 100 cm outside the treatment field edge on the patient plane for p(46)-Be neurons and are compared with the results obtained at the same points with a low-pressure proportional counter (Rossi counter) and a Bonner spheres system. General agreement is found between these independent methods. The dose equivalent at 5 and 100 cm distances outside the field edge is 2% and 0.4% of the dose equivalent at the isocenter. Measurements were also performed at the same points as a function of proton energy on the Be target. Proton energies of 25-46 MeV on Be were applied. The results indicate increase in the mean quality factor at proton energies below 30 MeV. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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