Journal of Medical Physics
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Year : 2015  |  Volume : 40  |  Issue : 1  |  Page : 13-17

Monte Carlo-based dose calculation for 32 P patch source for superficial brachytherapy applications

1 Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India
2 Isotope Production and Applications Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra, India

Correspondence Address:
Sridhar Sahoo
Radiological Physics and Advisory Division, CT CRS Building, Bhabha Atomic Research Centre, Mumbai 400 094,
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0971-6203.152232

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Skin cancer treatment involving 32 P source is an easy, less expensive method of treatment limited to small and superficial lesions of approximately 1 mm deep. Bhabha Atomic Research Centre (BARC) has indigenously developed 32 P nafion-based patch source (1 cm Χ 1 cm) for treating skin cancer. For this source, the values of dose per unit activity at different depths including dose profiles in water are calculated using the EGSnrc-based Monte Carlo code system. For an initial activity of 1 Bq distributed in 1 cm 2 surface area of the source, the calculated central axis depth dose values are 3.62 Χ 10 -10 GyBq -1 and 8.41 Χ 10 -11 GyBq -1 at 0.0125 and 1 mm depths in water, respectively. Hence, the treatment time calculated for delivering therapeutic dose of 30 Gy at 1 mm depth along the central axis of the source involving 37 MBq activity is about 2.7 hrs.

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