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首页> 外文会议>Waste management 2004 symposium (WM'04): waste management, energy security and a clean environment >GAMMA RAY TO NEUTRON PRODUCTION RATES FORα-PARTICLE INDUCED REACTIONS ON Li,Be,B,C and F
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GAMMA RAY TO NEUTRON PRODUCTION RATES FORα-PARTICLE INDUCED REACTIONS ON Li,Be,B,C and F

机译：Li，Be，B，C和F上α粒子诱发的中子射线对中子产率的影响

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The assay of Pu bearing nuclear materials by the neutron coincidence counting technique is often undertaken assuming that the ratio,Alpha,of(α,n)to(SF,n)production in the item is well known.If this is not the case then a bias can result.As the Alpha value increases the precision and accuracy can be seriously compromised and complementary measurement techniques may be needed to lend added confidence in the assay.The presence of relatively low concentrations of low atomic number impurities in product materials such as metals and oxides are well known to significantly enhance(α,n)production rates.The associated production of characteristicγ- rays has been used to identify such situations[1].The potential application to waste assay measurements has been recognized[2]but limited validated production data exists in the literature. rnIn this paper we report the measurement of the production rate of the characteristic gamma rays for Li,Be,B,C and F relative to the production rate of neutrons resulting from α-particle reactions in sealed sources.The experimental work was an evolution of the approach set out previously[3].In the case of the Li,Be,B and F sources, ~241 Am was used as the alpha emitter. Two Li and six Be sources were studied.In addition a source containing anhydrous PuF_3 was investigated.The C source used ~238 Pu oxide mixed with graphite powder enriched in ~13C. Multiple measurements,for the same target element,were taken to allow the variation due to fabrication and form to be assessed empirically.The yield per alpha was also extracted using mass loadings of the alpha emitter derived from the measured high resolution gamma ray spectra where possible or,in the case of the Be sources,from production data.
机译：通常假设中子的（α，n）与（SF，n）产生的Alpha比率是已知的，通常采用中子重合计数技术进行含Pu核材料的分析。随着Alpha值的增加，精度和准确性可能会受到严重损害，并且可能需要补充测量技术以增强测定的信心。产品材料（例如金属）中存在较低浓度的低原子序数杂质众所周知，氧化物和氧化物能显着提高（α，n）的生产率。相关的特征性γ射线的产生已被用于识别这种情况[1]。人们已经认识到废物分析测量的潜在应用[2]，但验证有限生产数据存在于文献中。在本文中，我们报告了相对于密封源中α粒子反应产生的中子产生速率，测量Li，Be，B，C和F的特征性伽马射线产生速率的方法。以前提出的方法[3]。在Li，Be，B和F光源的情况下，〜241 Am被用作alpha发射器。研究了两个Li源和六个Be源，另外还研究了一个包含无水PuF_3的源.C源使用〜238 Pu氧化物和富含〜13C的石墨粉混合而成。对同一目标元素进行多次测量，以根据制造和形状的变化进行经验评估。在可能的情况下，还使用源自测量的高分辨率伽玛射线光谱的α发射体的质量负载来提取每α的产率。如果是Be来源，则来自生产数据。

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