Study of prompt and residual activities from proton irradiation on Nb, Ta and Fe targets
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Study of prompt and residual activities from proton irradiation on Nb, Ta and Fe targets Sabyasachi Paul1 · D. S. Joshi1 · A. A. Shanbhag1 · G. S. Sahoo1 · S. P. Tripathy1,2 · S. C. Sharma3 · M. S. Kulkarni1,2 Received: 22 January 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract Current research in the accelerator technology is focused towards achieving high energy, intense beams by minimizing conversion losses during beam acceleration. In such high current facilities, induced activity in structural materials become primary concern for radiation protection and materials like Ta and Nb, with low induced activity generation, high corrosion resistance characteristics are preferred along with conventional structural materials. In view of significant use of elements like Nb, Ta and Fe in the proton accelerators, a dose rate measurement and decay study has been carried out. The prompt γ- and neutron doses with residual activity profile from short and long lived isotopes were estimated using γ-ray spectrometric method. Keywords Induced radioactivity · Short-lived isotope dose profile · γ-ray spectrometry · Dose rate measurement
Introduction Presently the ongoing research on accelerator technology is aimed to attain high energies with large particle fluence rates. In this context to achieve such goals, research is motivated towards the minimum conversion losses during the particle acceleration. Losses mostly arise from the conversion of radio frequency (RF) waves to the particle energies and other subsequent losses in beam focusing techniques. Among these, the RF loss in room temperature is huge and materials with superconducting nature can greatly improve the conversion efficiency. So to achieve maximum conversion efficiency, a lot of research is underway through fabrication of cavities with superconducting materials like Nb [1–3]. Apart from its superconducting nature, the Nb also has other advantages like excellent corrosion resistivity and easy to machine characteristics due to ductile nature [4]. It is also used as additive in steel, nickel base super alloys and heat resistant alloys, which * Sabyasachi Paul [email protected] 1
Health Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
2
Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, India
3
Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
are vastly used at different applications in the nuclear and accelerator technologies. In the high current applications, the radiation related issues are also quite prominent at the beam loss points like beam dump and focusing points [5, 6]. So, selection of materials with minimum induced activity in the structural material is one important aspect in these facilities with minimum corrosion characteristics. For such applications, Ta can be used as the beam dump in accelerator and in other applications considering very low induced activity formation in the material. Ta is also highly corrosion resistant material, even at high temperature applica
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