open access

Vol 22, No 3 (2017)
Original research articles
Published online: 2017-05-01
Submitted: 2016-07-14
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Estimation of peripheral dose from Co beam in water phantom measured in Secondary Standard Dosimetry Laboratory, Pakistan

Muhammad Shahban, Babar Hussain, Khalid Mehmood, Shakeel Ur Rehman
DOI: 10.1016/j.rpor.2016.12.002
·
Rep Pract Oncol Radiother 2017;22(3):212-216.

open access

Vol 22, No 3 (2017)
Original research articles
Published online: 2017-05-01
Submitted: 2016-07-14

Abstract

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[[ce:hsp sp="0.25"/]]×[[ce:hsp sp="0.25"/]]7[[ce:hsp sp="0.25"/]]cm2, 10[[ce:hsp sp="0.25"/]]×[[ce:hsp sp="0.25"/]]10[[ce:hsp sp="0.25"/]]cm2 and 15[[ce:hsp sp="0.25"/]]×[[ce:hsp sp="0.25"/]]15[[ce:hsp sp="0.25"/]]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[[ce:hsp sp="0.25"/]]cm with an interval of 2.5[[ce:hsp sp="0.25"/]]cm. Measurements were made at equal transverse distances along the horizontal axis, from 1[[ce:hsp sp="0.25"/]]cm to 6[[ce:hsp sp="0.25"/]]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[[ce:hsp sp="0.25"/]]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.

Abstract

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[[ce:hsp sp="0.25"/]]×[[ce:hsp sp="0.25"/]]7[[ce:hsp sp="0.25"/]]cm2, 10[[ce:hsp sp="0.25"/]]×[[ce:hsp sp="0.25"/]]10[[ce:hsp sp="0.25"/]]cm2 and 15[[ce:hsp sp="0.25"/]]×[[ce:hsp sp="0.25"/]]15[[ce:hsp sp="0.25"/]]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[[ce:hsp sp="0.25"/]]cm with an interval of 2.5[[ce:hsp sp="0.25"/]]cm. Measurements were made at equal transverse distances along the horizontal axis, from 1[[ce:hsp sp="0.25"/]]cm to 6[[ce:hsp sp="0.25"/]]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[[ce:hsp sp="0.25"/]]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.

Get Citation

Keywords

Co60 beam; Peripheral dose; Water phantom; SSDL

About this article
Title

Estimation of peripheral dose from Co beam in water phantom measured in Secondary Standard Dosimetry Laboratory, Pakistan

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 22, No 3 (2017)

Pages

212-216

Published online

2017-05-01

DOI

10.1016/j.rpor.2016.12.002

Bibliographic record

Rep Pract Oncol Radiother 2017;22(3):212-216.

Keywords

Co60 beam
Peripheral dose
Water phantom
SSDL

Authors

Muhammad Shahban
Babar Hussain
Khalid Mehmood
Shakeel Ur Rehman

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