MICRODOSIMETRIC MEASUREMENT OF SECONDARY RADIATION IN THE PASSIVE SCATTERED PROTON THERAPY ROOM OF iTHEMBA LABS USING A TISSUE-EQUIVALENT PROPORTIONAL COUNTER

被引：1

作者：

Chiriotti, S. ^{[1
]}

Parisi, A. ^{[1
]}

Vanhavere, F. ^{[1
]}

De Saint-Hubert, M. ^{[1
]}

Vandevoorde, C. ^{[2
]}

Slabbert, J. ^{[2
]}

Beukes, P. ^{[2
]}

de Kock, E. ^{[2
]}

Symons, J. ^{[2
]}

机构：

[1] SCK CEN, Belgian Nucl Res Ctr, Boeretang 200, Mol, Belgium

[2] NRF iThemba LABS, Cape Town, South Africa

来源：

RADIATION PROTECTION DOSIMETRY | 2018年 / 182卷 / 02期

关键词：

DOSE-EQUIVALENT; CALIBRATION; RISK;

D O I：

10.1093/rpd/ncy056

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Measurements of the dose equivalent at different distances from the isocenter of the proton therapy center at iThemba LABS were previously performed with a tissue-equivalent proportional counter (TEPC). These measurements showed that the scattered radiation levels were one or two orders of magnitude higher in comparison to other passive scattering delivery systems. In order to reduce these radiation levels, additional shielding was installed shortly after the measurements were done. Therefore, the aim of this work is to quantify and assess the reduction of the secondary doses delivered in the proton therapy room at iThemba LABS after the installation of the additional shielding. This has been performed by measuring microdosimetric spectra with a TEPC at 11 locations around the isocenter when a clinical modulated beam of 200 MeV proton was impinging onto a water phantom placed at the isocenter.

引用

页码：252 / 257

页数：6

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