Journal of Medical Physics
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ORIGINAL ARTICLE
Year : 2017  |  Volume : 42  |  Issue : 1  |  Page : 18-24

Structural shielding design of a 6 MV flattening filter free linear accelerator: Indian scenario


1 Radiological Safety Division, Atomic Energy Regulatory Board, Niyamak Bhavan, Mumbai, Maharashtra, India
2 Radiological Physics and Advisory Division, Health Safety and Environmental Group, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India

Correspondence Address:
Bibekananda Mishra
Radiological Safety Division, Atomic Energy Regulatory Board, Mumbai - 400 094, Maharashtra
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jmp.JMP_99_16

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Detailed structural shielding of primary and secondary barriers for a 6 MV medical linear accelerator (LINAC) operated with flattening filter (FF) and flattening filter free (FFF) modes are calculated. The calculations have been carried out by two methods, one using the approach given in National Council on Radiation Protection (NCRP) Report No. 151 and the other based on the monitor units (MUs) delivered in clinical practice. Radiation survey of the installations was also carried out. NCRP approach suggests that the primary and secondary barrier thicknesses are higher by 24% and 26%. respectively, for a LINAC operated in FF mode to that of a LINAC operated in both FF and FFF modes with an assumption that only 20% of the workload is shared in FFF mode. Primary and secondary barrier thicknesses calculated from MUs delivered on clinical practice method also show the same trend and are higher by 20% and 19%, respectively, for a LINAC operated in FF mode to that of a LINAC operated in both FF and FFF modes. Overall, the barrier thickness for a LINAC operated in FF mode is higher about 20% to that of a LINAC operated in both FF and FFF modes.


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