Calorimetric determination of the absorbed dose to water for medium-energy x-rays with generating voltages from 70 to 280 kV

被引：34

作者：

Krauss, A. ^{[1
]}

Bueermann, L. ^{[1
]}

Kramer, H-M ^{[1
]}

Selbach, H-J ^{[1
]}

机构：

[1] Phys Tech Bundesanstalt, D-38116 Braunschweig, Germany

来源：

PHYSICS IN MEDICINE AND BIOLOGY | 2012年 / 57卷 / 19期

关键词：

RADIOTHERAPY; DOSIMETRY;

D O I：

10.1088/0031-9155/57/19/6245

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

For medium energy x-rays produced with tube voltages from 70 to 280 kV, the absorbed dose to water, D-w, has been determined by means of water calorimetry with relative standard uncertainties ranging from 0.45% to 0.98% at 280 and 70 kV. The results were confirmed by Monte Carlo calculations, in which the ratios of D-w at 5 cm depth in a reference water phantom to the air kerma free in air, K-a, at the same point in space were compared to the corresponding ratios determined experimentally. The general agreement between measurement and calculation was better than 1%. These results confirm earlier investigations in which the absorbed dose to graphite was determined by means of a graphite extrapolation chamber. For the Monte Carlo calculations, an attempt was made to present a complete uncertainty budget, taking into account type B contributions also.

引用

页码：6245 / 6268

页数：24