Program Information
Characterization and Application of Bubble Detector for Photo-Neutron Dose Measurement in Elekta Versa HD Medical Accelerator
H sahib1 , B Ganesan2*, N Sekar3 , T Lakshminarayanan4 , S Jagadeesan5 , A Prakasarao6 , M D.K7 , M Murugan8 , G Singaravelu9 , (1) Anna University, Chennai, Tamil Nadu, (2) ,,,(3) Anna university, Chennai, TamilNadu, (4) Safety research Institute, AERB, Kancheepuram, TamilNadu, (5) VPS Lakeshore Hospital, Ernakulam, Kerala, (6) Anna University, Chennai, TamilNadu, (7) Safety research Institute, AERB, Kancheepuram, TamilNadu, (8) VPS Lakeshore Hospital, Ernakulam, Kerala, (9) Anna University, Chennai, TamilNadu
Presentations
SU-I-GPD-T-540 (Sunday, July 30, 2017) 3:00 PM - 6:00 PM Room: Exhibit Hall
Purpose: The present study investigates characterization and measured photo neutron dose equivalents produced in Elekta Versa HD linear accelerator (LINAC)using the Bubble Detector Personal Neutron Dosimeters (BD-PND) manufactured by Bubble Technology Industries (BTI), Canada. Initially BD-PND dosimeters were characterized using 1Ci Am-Be neutron source and its performance were evaluated for primary and scattered neutron dose measurements and the same is compared with the theoretical Monte Carlo (MC) simulations.
Methods: The characterization of the bubble dosimeters were carried out in terms of sensitivity, linearity, isotropic response andreproducibility. The response of BD-PND to Am-Be source of 1Ci source were measured using the bubble detector for various distances, angles and time intervals to establish the above characteristics and the effect of scattering was also calculated through equivalent theoretical MC simulations using MCNP code which have been carried with/without scattering modeling. In LINAC, Out-of-Field photo neutron dose were measured along the patient plane various distances range from 25 cm to 150 cm at step interval of 25 cm for 10MV photon. Different sensitivity BD-PND dosimeters were used.
Results: The observed reading show that BD-PND dosimeters were angular independent, linear with respect to dose and time, dose decreases with increasing distances and measured results were compared MC simulation which show percentage of deviation were within the acceptable limits. The BD-PND dosimeter reveals the reliability in accounting primary and scatter dose. In LINAC, the maximum photo neutron dose equivalent was measured at 25 cm with respect to other distances and variation in Photo-neutron dose equivalentofsame sensitivityBD-PND is observed.
Conclusion: The current study exhibits the reliability and accuracy of BD-PND bubble dosimeters for ambient neutron dose equivalent measurements in high photon flux, mixed gamma/photon and neutron fields.
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