Neutron fluence measurements of the Siemens Oncor linear accelerator utilizing gold foil activation
Moderated gold foil activation was used to measure the neutron fluence from the Siemens Oncor linear accelerator. Measurements were made both in the photon beam and in peripheral locations using 20x20cm jaw settings. The head leakage was measured as well, with the jaws closed as is prescribed in AAP...
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| Format: | Dissertation |
| Language: | English |
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ProQuest Dissertations & Theses
01-01-2006
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| Online Access: | Get full text |
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| Summary: | Moderated gold foil activation was used to measure the neutron fluence from the Siemens Oncor linear accelerator. Measurements were made both in the photon beam and in peripheral locations using 20x20cm jaw settings. The head leakage was measured as well, with the jaws closed as is prescribed in AAPM report 19. The neutron fluence values then were used to calculate source strength (Q) along with the respective equivalent doses. The neutron fluence from the 20cm x 20cm field resulted in a Q value of 0.33 x 10 12 n/Gy. The peripheral dose equivalent was found to be 0.27 mSv/Gy at a 100cm radius from isocenter. The in-beam neutrons delivered a dose of 0.958 mGy/Gy. The total neutron leakage through the head was 2.8 x 10 6 n/cm2/Gy, measured at 28cm out from the isocenter. It was found that the neutron production did not pose any risk greater than other machines currently available. |
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| ISBN: | 9780542744204 0542744201 |