Calculation of photoneutron contamination of Varian linac with new target in tissue equivalent phantom using Monte Carlo simulation

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Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
Introduction

In this research, a new material (Ti2V0.7Cu97.3) was proposed for the target of medical linear accelerators (linacs) to reduce the production of unwanted photoneutrons in the radiotherapy. So, the fluence, dose equivalent and kerma of the photoneutrons were calculated in a soft tissue phantom.

Materials and Methods

The medical linac was the Varian 2100 C/D 18 MV, which its tungsten target was replaced with a new multi-metal target (Ti2V0.7Cu97.3). Desired quantities were computed in a ICRU soft tissue phantom, using the Monte Carlo code MCNPX (v. 2.6).

Results

The ratio of the maximums of fluence, kerma, and dose equivalent of photoneutrons along the central axis of the ICRU phantom with new target rather than tungsten target were 72 %, 59 % and 61 %, respectively. Average of the Ratio of fluence, kerma, and dose equivalent in inner area (distances less than 5 cm from central axis) at different depths of the phantom with new target rather than tungsten target were 78 %, 70 % and 75 %, respectively. Uncertainties at all points were less than 5 % (except for a few points which were less than 10 %).

Conclusion

This work showed that applying Ti2V0.7Cu97.3 alloy for the target of linac, can reduce the produced photoneutrons up to 38 % by an applicable and inexpensive way.

Language:
English
Published:
Journal of Basic Research in Medical Sciences, Volume:9 Issue: 3, Summer 2022
Pages:
31 to 41
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