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由于黄铜被广泛地使用于生产和生活的各个领域,在法庭科学中常可遇到微量黄铜的鉴定问题。由于检材具有数量少、质量小、形状不规整和成份不均匀等特点,不能用金相、化学等等常规的方法作出鉴定,亦不能用常规的微区X射线谱分析法获得准确的定量结果。不能制得镜面的试样,只能在立体显微镜下挑拣出检材,然后超声清洗,被石墨试样台上的石墨导电胶薄膜粘取。为了消减成份不均匀的影响,需在很小很少的检材上测量尽可能多的微区,以便得到准确的平均值。但是这些微区的出射角各不相同。而且无法测定其真正的角度。这些微区谱可彼此相差很大,用常规的ZAF法根本无法准确定量。但是又必需获得准确定量分析的数据才具有物证的价值。这个必需就是我们的任务。
Because brass is widely used in various fields of production and life, the identification of trace brass is often encountered in forensic science. Due to the small number of samples, the quality of small, irregular shape and composition of non-uniform features, can not be metallurgical, chemical and other conventional methods to make identification, nor can the conventional micro-X-ray spectroscopy to obtain accurate quantitative result. Can not be made of the mirror sample, only under the stereomicroscope pick out the test material, and then ultrasonic cleaning, graphite sample by the graphite conductive adhesive film sticking. In order to reduce the effect of nonuniformity of the ingredients, it is necessary to measure as many microdots as possible on a very small number of specimens so as to obtain an accurate average value. However, the exit angle of these microdisks varies. And can not determine its true point of view. These microdomains can vary greatly from one another and can not be accurately quantified using the conventional ZAF method. However, the data that must be accurately and quantitatively analyzed have the value of material evidence. This necessity is our task.