Proton energy determination using activated yttrium foils and ionization chambers for activity assay

• Published in: Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2009-05, Vol.267 (10), p.1867-1872
• Main Authors: Avila-Rodriguez, M.A., Rajander, J., Lill, J.-O., Gagnon, K., Schlesinger, J., Wilson, J.S., McQuarrie, S.A., Solin, O.
• Format: Article
• Language: English
• Subjects: Assaying; Cyclotrons; Foils; Ionization chambers; Irradiation; Mathematical models; Monitor reactions; Nuclear reactions; Proton energy; Proton energy determination; Spectroscopy; Yttrium foils
• ISSN: 0168-583X; 1872-9584
• DOI: 10.1016/j.nimb.2009.02.064

Excitation functions of the 89Y(p, xn) nuclear reactions were measured up to 18 MeV by the conventional activation method using the stacked-foil technique, and the irradiation of single foils. Activity assays of the irradiated foils were performed via ionization chamber and gamma spectroscopy methods. Activity ratios of the activation products were measured in two different facilities and evaluated for use as a practical and simple method for proton energy determinations. Cross section values measured in this work were compared with published data and with theoretical values as determined by the nuclear reaction model code EMPIRE II. In general, there was a good agreement between the experimental and theoretical values of the cross section data. Activity ratios of the isomeric and ground state of 89Zr measured via ionization chamber were found to be useful for proton energy determinations in the energy range from 7 to 15 MeV. Proton energies above 13 MeV were accurately determined using the 89gZr/ 88Zr and 89gZr/ 88Y activity ratios measured via gamma spectroscopy.