THE SYNCHROTRON RADIATION MICROPROBE AT THE SRS, DARESBURY (UK) AND ITS APPLICATIONS

被引：14

作者：

VANLANGEVELDE, F ^{[1
]}

TROS, GHJ ^{[1
]}

BOWEN, DK ^{[1
]}

VIS, RD ^{[1
]}

机构：

[1] FREE UNIV AMSTERDAM,DEPT PHYS & ASTRON,1007 MC AMSTERDAM,NETHERLANDS

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 1990年 / 49卷 / 1-4期

关键词：

D O I：

10.1016/0168-583X(90)90306-F

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A synchrotron microprobe has been constructed at the Synchrotron Radiation Source at Daresbury (UK). This instrument is capable of analyzing at the ppm level, or, in favourable cases, at the sub-ppm with a lateral resolution of 15 μm. A beam energy of 15 keV was chosen, in order to be able to scan a wide range of analyzable elements. Focusing and monochromation of the white beam was done in a single step with a high precision ellipsoidally curved Si(111) crystal, mounted on an aluminium support. Beam spots of a few tens of microns can be made using an object slit setting of 30 mm horizontally and 5 mm vertically without further collimation. In this spot sufficient flux of 15 keV (quasi-monochromatic) X-rays is available for measuring trace elements at the femtogram level. Measurements on biological materials demonstrated the lower detection limits obtainable with micro-SXRF as compared to micro-techniques using ion-accelerators, especially for the higher Z-elements. Moreover, the much lower energy deposited in the specimen represents a major argument for prefering X-rays to ions for the analysis of radiation sensitive samples. Measurements on a geological reference sample showed better sensitivities for X-rays than protons and electrons for the higher Z-elements. © 1990.

引用

页码：544 / 550

页数：7

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