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首页> 外文会议>International Conference on Advances in Destructive and Non-Destructive Analysis for Environmental Monitoring and Nuclear Forensics; 20021021-20021023; Karlsruhe; DE >DETERMINATION OF THE PLUTONIUM CONTENT OF PLUTONIUM-BERYLLIUM NEUTRON SOURCES: A FEASIBILITY STUDY
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DETERMINATION OF THE PLUTONIUM CONTENT OF PLUTONIUM-BERYLLIUM NEUTRON SOURCES: A FEASIBILITY STUDY

机译：BER-铍中子源THE含量的测定：可行性研究

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摘要

A non-destructive method of analysing sealed plutonium-beryllium sources is under development, using a combination of γ spectrometric determination of the plutonium isotope composition and neutron counting. A passive neutron collar was designed with nine ~3He counters embedded in a polyethylene moderator surrounding the sources to be measured. The measurement cavity is lined with cadmium to shield the source against slow neutrons diffusing backwards from the moderator. The electronics consist of a home-made, nine channel chain of pulse amplifiers and discriminators as well as a commercial shift register. The determination of plutonium content seems to be possible by establishing the neutron yield of the sources on the basis of total neutron counting, by adopting specific (γ,n) reaction yields of individual plutonium (and americium) isotopes from the literature. The coincidence counts are due to self-multiplication, i.e. neutron induced fission of the odd plutonium isotopes.
机译：目前正在开发一种结合γ光谱法测定p同位素组成和中子计数的无损分析sealed-铍源的方法。设计了一个被动中子项圈，在被测源周围的聚乙烯减速器中嵌入了九个〜3He计数器。测量腔内衬有镉，以保护放射源免受慢速中子从减速器向后扩散。电子器件包括一个自制的九通道脉冲放大器和鉴频器链，以及一个商用移位寄存器。 total含量的测定似乎可以通过在总中子计数的基础上确定放射源的中子产率，并采用文献中单个p（和a）同位素的特定（γ，n）反应产率来确定。巧合计数是由于自增，即中子引起的奇odd同位素的裂变。

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