Abstract：
: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.
journal_name
Australas Phys Eng Sci Medjournal_title
Australasian physical & engineering sciences in medicineauthors
Burrage JW,Asad AH,Fox RA,Price RI,Campbell AM,Siddiqui Sdoi
10.1007/BF03178634subject
Has Abstractpub_date
2009-06-01 00:00:00pages
92-7issue
2eissn
0158-9938issn
1879-5447journal_volume
32pub_type
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