Radiation measurements after irradiation of silicon for neutron transmutation doping

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• 作者：L. Viererbl ; V. Klup谩k ; M. Vin拧 ; Z. Lahodov谩 ; A. Kolmistr ; J. Stehno
• 关键词：Neutron transmutation doping ; Silicon homogeneity ; Research reactor ; Beta radiation
• 刊名：Radiation Physics and Chemistry
• 出版年：February, 2014
• 年：2014
• 卷：95
• 期：Complete
• 页码：389-391
• 全文大小：321 K

文摘

Neutron transmutation doping of semiconductors is an important method for applications that require high dopant homogeneity. For silicon, it is based on the conversion of ³⁰Si into ³¹P through a ³⁰Si (n,纬) ³¹Si reaction during neutron irradiation following beta decay of ³¹Si to ³¹P. Neutron irradiation is usually performed in research reactors. The main characteristics of a doped silicon sample are (1) purity of the original silicon, (2) average phosphorus concentration and (3) phosphorus concentration homogeneity (uniformity). This paper describes measurement methods that utilise radiation induced during doping irradiation to measure these characteristics. The first two parameters can be measured using gamma spectrometry. The main part of the paper deals with homogeneity measurement. It describes a measurement method that is based on the detection of beta radiation from ³¹Si. Examples of experimental results are given. The experiments were performed in the LVR-15 research reactor.