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Volume 22, Number 3, 2017
Estimation of peripheral dose from Co60 beam in water phantom measured in Secondary Standard Dosimetry Laboratory, Pakistan
Muhammad Shahban, Babar Hussain, Khalid Mehmood, Shakeel Ur Rehman
Summary:
Background
Peripheral or scatter dose harms neighbouring normal tissues during administration of dose to cancerous tissues, therefore, knowledge of peripheral dose is an important consideration in radiotherapy.
Aim
In present study, absorbed dose measurements in a water phantom were performed for three field sizes, 7 × 7 cm2, 10 × 10 cm2 and 15 × 15 cm2.
Materials and methods
For each field size, dose was measured at six depths below the front surface of the water phantom; 2.5–15 cm with an interval of 2.5 cm. Measurements were made at equal transverse distances along the horizontal axis, from 1 cm to 6 cm, on both sides of the central beam axis and normalized with central axis dose of each field. All measurements were made at the source to surface distance of 100 cm.
Results
Variation of peripheral dose with lateral distance was analysed and an appropriate parametric equation for each field size and depth was constructed.
Conclusions
The peripheral radiation dose showed a strong dependence on field size and distance from field boundary.
http://www.sciencedirect.com/science/journal/15071367