Author: Upadhyay, N.
Paper Title Page
TUPAB404 Monte Carlo Studies for Shielding Design for High Energy Linac for Medical Isotope Generation 2469
 
  • N. Upadhyay, S. Chacko
    University of Mumbai, Mumbai, India
  • A.P. Deshpande, T.S. Dixit, P.S. Jadhav, R. Krishnan
    SAMEER, Mumbai, India
  
  The widely used ra­dioac­tive tracer Tech­netium-99m (99mTc) is tra­di­tion­ally pro­duced from Ura­nium via 235U (n, f) 99Mo re­ac­tions which de­pends heav­ily on nu­clear re­ac­tors. De­sign stud­ies for an al­ter­na­tive, cleaner ap­proach for ra­dioiso­tope gen­er­a­tion using a high en­ergy elec­tron linac were ini­ti­ated at SAMEER to gen­er­ate 99Mo. The elec­tron beam from a 30 MeV linac with an av­er­age cur­rent of 350 µA will be bom­barded on a con­ver­tor tar­get to pro­duce X-rays which will be bom­barded on en­riched 100Mo tar­get to pro­duce 99Mo via (g, n) re­ac­tion. 99mTc will be eluted from 99Mo. The pho­tons and neu­trons pro­duced in the process should be shielded ap­pro­pri­ately to en­sure ra­di­a­tion safety. This paper brings out the use of Monte Carlo tech­niques for pho­ton and neu­tron shield­ing for our ap­pli­ca­tion. We used FLUKA to cal­cu­late the flu­ence, an­gu­lar dis­tri­b­u­tion and dose for pho­tons and neu­trons. Then, we in­tro­duced var­i­ous lay­ers of lead fol­lowed by HDPE, 5% bo­rated HDPE and 40% boron rub­ber to en­sure that the pro­posed shield­ing is suf­fi­cient to com­pletely shield the pho­ton as well as neu­tron ra­di­a­tion and hence is safe for op­er­a­tion.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB404  
About • paper received ※ 19 May 2021       paper accepted ※ 22 June 2021       issue date ※ 25 August 2021  
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TUPAB405 Design of High Energy Linac for Generation of Isotopes for Medical Applications 2472
 
  • A.P. Deshpande, S.R. Bhat, T.S. Dixit, P.S. Jadhav, A.S. Kottawar, R. Krishnan, M.S. Kumbhare, J. Mishra, C.S. Nainwad, S.R. Name, R. Sandeep Kumar, A. Shaikh, K.A. Thakur, M.M. Vidwans, A. Waingankar
    SAMEER, Mumbai, India
  • A.K. Mishra
    INMAS, New Delhi, India
  • N. Upadhyay
    University of Mumbai, Mumbai, India
  
  Funding: Ministry of Electronics and Information Technology (MeitY), Govt. of India.
After suc­cess­ful im­ple­men­ta­tion of 6 and 15 MeV elec­tron lin­ear ac­cel­er­a­tor (linac) tech­nol­ogy for Can­cer Ther­apy in India, we ini­ti­ated the de­vel­op­ment of high en­ergy high cur­rent ac­cel­er­a­tor for the pro­duc­tion of ra­dioiso­topes for di­ag­nos­tic ap­pli­ca­tions. The ac­cel­er­a­tor will be of 30 MeV en­ergy with 350 µA av­er­age cur­rent pro­vided by a grid­ded gun. The linac is a side cou­pled stand­ing wave ac­cel­er­a­tor op­er­at­ing at 2998 MHz fre­quency op­er­at­ing at p/2 mode. The choice of p/2 op­er­at­ing mode is par­tic­u­larly suit­able for this case where the rep­e­ti­tion rate will be around 400 Hz. Kly­stron with 7 MW peak power and 36 kW av­er­age power will be used as the RF source. The mod­u­la­tor will be a solid-state mod­u­la­tor. The con­trol sys­tem is FPGA based setup de­vel­oped in-house at SAMEER. A re­tractable tar­get with tung­sten will be used as a con­verter to gen­er­ate X-rays via bremsstrahlung. The x-rays will then in­ter­act with en­riched 100Mo tar­get to pro­duce 99Mo via (g, n) re­ac­tion. Eluted 99mTc will be used for di­ag­nos­tic ap­pli­ca­tions. The paper lists the chal­lenges and novel schemes de­vel­oped at SAMEER to make a com­pact, rugged, and easy to use sys­tem keep­ing in mind local con­di­tions. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB405  
About • paper received ※ 19 May 2021       paper accepted ※ 23 June 2021       issue date ※ 02 September 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)