MEASUREMENT OF ACCELERATOR BREMSSTRAHLUNG SPECTRA WITH A HIGH-EFFICIENCY GE DETECTOR

被引：31

作者：

LANDRY, DJ ^{[1
]}

ANDERSON, DW ^{[1
]}

机构：

[1] TULSA REG MED CTR,TULSA,OK 74127

来源：

MEDICAL PHYSICS | 1991年 / 18卷 / 03期

关键词：

D O I：

10.1118/1.596658

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

A Compton spectrometer with a high-efficiency Ge detector was used to measure photon spectra from clinical accelerators. The response-function matrix for the detector system was determined using ten radioactive sources that emitted gamma rays of single energy ranging from 279-1525 keV. The system was tested by measuring the spectrum from a Co-60 teletherapy machine. The energy distribution of tungsten target bremsstrahlung produced by 2.2, 2.5, 15, 20, and 25 MeV electrons in two clinical accelerators were determined. Theoretical thin-target calculations overestimate the number of photons in the high-energy regions of the spectra, as was expected. However, theoretical thick-target calculations underestimate the numbers of high-energy photons.

引用

页码：527 / 532

页数：6

共 23 条

[1] SPECTRA OF INTERNALLY SCATTERED RADIATION FROM LARGE CO60 SOURCES USED IN TELETHERAPY [J].