A simple method to measure proton beam energy in a standard medical cyclotron
| Autor: | Salim Siddiqui, John Burrage, AH Asad, AM Campbell, Roger I. Price, Fox Ra |
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| Rok vydání: | 2009 |
| Předmět: |
Materials science
Proton Cyclotron Biomedical Engineering Biophysics General Physics and Astronomy Stopping power law.invention Stack (abstract data type) law Radiology Nuclear Medicine and imaging Nuclear Experiment Radiometry FOIL method business.industry Detector Electrical engineering Cyclotrons Reference Standards Zinc Beamline Physics::Accelerator Physics Atomic physics Protons business Energy (signal processing) Copper |
| Zdroj: | Australasian physicalengineering sciences in medicine. 32(2) |
| ISSN: | 0158-9938 |
| Popis: | A simple and rapid technique to measure the proton beam energy in the external beam line of a medical cyclotron has been examined. A stack of 0.1 mm thick high purity copper (Cu) foils was bombarded and the relative activity of 65Zn produced in each foil was compared to a computational model that predicted activity, based on proton stopping power, reaction cross-sectional data, and beam energy. In the model, the beam energy was altered iteratively until the best match between computed and measured relative activities of the stack of disks was obtained. The main advantage of this method is that it does not require the comparison of the activities of different isotopes of zinc arising from (p, xn) reactions in the Cu, which would require the gamma photon detector being calibrated for different energy responses. Using this technique the proton beam energy of a nominally 18 MeV standard isochronous medical cyclotron was measured as 17.49 +/- 0.04 (SD) MeV, with a precision of 0.2% CV. |
| Databáze: | OpenAIRE |
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