MOSFET dosimeters: The role of encapsulation on dosimetric characteristics in mixed gamma-neutron and megavoltage X-ray fields

被引：52

作者：

Rosenfeld, AB ^{[1
]}

Carolan, MG ^{[1
]}

Kaplan, GI ^{[1
]}

Allen, BJ ^{[1
]}

Khivrich, VI ^{[1
]}

机构：

[1] ST GEORGE HOSP,CANC CARE CTR,KOGARAH,NSW 2217,AUSTRALIA

来源：

IEEE TRANSACTIONS ON NUCLEAR SCIENCE | 1995年 / 42卷 / 06期

关键词：

D O I：

10.1109/23.489229

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper is concerned with the role of the package of MOSFETs used in measurements of gamma dose in mixed gamma-neutron fields, in high energy bremsstrahlung and soft X-ray fields. It is shown that a kovar cap should be avoided for dosimetry applications in the presence of strong thermal neutron fluences. In regions of strong electronic disequilibrium the 'bare' or unencapsulated MOSFET is a unique tool for surface dose measurements and Monte Carlo model validation. For depths where electronic equilibrium exists (ie. x > depth of D-max) the MOSFET package is not critical. For low energy X-ray fields the energy dependence of the dose enhancement factor (DEF) will differ depending upon whether the irradiation is performed in free air geometry or on the surface of a phantom.

引用

页码：1870 / 1877

页数：8

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