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 of65Zn 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.
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Kim, J. H., Park, H., Kim, S., Lee, J. S. and Chun, K. S.,Proton beam energy measurement with the stacked Cu foil technique for medical radioisotope production, J Kor Phys Soc, 48(4): 755–758, 2006.
Kopecký, P.,Proton beam monitoring via the Cu(p, x) 58 Co,63 Cu(p, 2n)62 Zn and 65 Cu(p, n)65 Zn reactions in copper, Int J Appl Rad Isot, 36(8): 657–661, 1985.
Robson, L., McKenna, P., McCanny, T., Ledingham, K. W. D., Gillies, J. M., and Zweit, J.,High-power laser production of PET isotopes, Lect Notes Phys, 694: 191–203, 2006.
Berger, M. J., Coursey, J. S., Zucker, M. A., and Chang, J.,Stopping-power and range tables for electrons, protons, and helium ions, National Institute of Standards and Technology, 2005, viewed 15 December 2006, http://physics.nist.gov/ PhysRefData/Star/Text/contents.html.
De Laeter, J. R., Böhlke, J. K., De Bièvre, P., Hidaka, H., Peiser, H. S., Rosman, K. J. R., and Taylor P. D. P.,Atomic weights of the elements: review 2000, Pure Appl Chem, 75(6): 683–800, 2003.
Collé, R., Kishore, R., and Cumming, J. B.,Excitation functions for (p, n) reactions to 25 MeV on 63 Cu,65 Cu, and 107 Ag, Phys Rev C, 9(5): 1819–1830, 1974.
Grüttner, A.,Excitation functions for radioactive isotopes produced by proton bombardment of Cu and Al in the energy range of 16 to 70 MeV, Nuc Phys, A383: 98–108, 1982.
Levkovskij, V. N.,Activation cross section of nuclides of average masses (40–100) by protons and alpha particles with average energies 10–50 MeV, Experimental Nuclear Reaction Data File (EXFOR), IAEA Nuclear Data Centre, 1991.
Nickles, R.J.,Production of a broad range of radionuclides with an 11 MeV proton cyclotron, J Label Compd Radiopharm., 30: 120–121, 1991.
Dmitriev, P. P., and Molin, G. A.Radioactive nuclide yields for thick target at 22 MeV proton energy, Experimental Nuclear Reaction Data File (EXFOR), IAEA Nuclear Data Centre, 1981.
Le Laboratoire National Henri Becquerel (LNHB),Nucléide Gamma and Alpha Library 2007, LNHB, 2007, viewed 11 February 2007, http://laraweb.free.fr/.
Ziegler, J. F., Biersack, J. P., and Ziegler, M. D.,The stopping and range of ions in matter, Lulu Press, Morrisville, NC, USA, 2008, viewed 20 January 2009, http://www.srim.org.
Strijckmans, K.The isochronous cyclotron: principles and recent developments, Comp Med Imaging Graphics, 25: 69–78, 2001.
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Burrage, J.W., Asad, A.H., Fox, R.A. et al. A simple method to measure proton beam energy in a standard medical cyclotron*. Australas. Phys. Eng. Sci. Med. 32, 92–97 (2009). https://doi.org/10.1007/BF03178634
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DOI: https://doi.org/10.1007/BF03178634