Bullet identification with radiography.
Bullet identification with radiography.
复制标题
通过射线照相进行子弹识别。
作者：
R. P. Bixler;C. Ahrens;R. Rossi;D. Thickman
作者提供了一种简单的射线照相方法来估计变形和未变形子弹的子弹重量和口径，从而能够准确地确定子弹形状范围的口径，并具有已知的置信度。重量测定程序是基于子弹横截面积（由三张正交x光片得出）和子弹重量（由从人体取出的48颗子弹的特性数据库确定）之间的相关性。对于重量不超过5.8克和小于5.8克的子弹，研究人员开发了不同的公式。对于相对未变形的子弹，另一种方法是直接从x光片上的弹体直径计算口径。这两种方法都能准确预测子弹的重量和口径；如果一种方法不能使用，另一种方法的结果是可靠的。基于这些结果的证词已被当地警方接受，并可能符合美国法院涉及枪击案件的证词要求。
The authors provide a simple radiographic method for estimating bullet weight and caliber of both deformed and undeformed bullets that enables accurate determination of caliber for the gamut of bullet shapes, with known degrees of confidence. The weight-determination procedure is based on the correlation between bullet cross-sectional area, as derived from three orthogonal radiographs, and bullet weight, as determined from a data base of the properties of 48 bullets removed from humans. Different equations were developed for bullets weighing 5.8 g or less, or more than 5.8 g. For relatively undeformed bullets an additional method calculated caliber directly from the diameter of the bullet body on radiographs. Both methods enabled correct prediction of the weight and caliber of the bullets; if one method could not be used, results of the other were reliable. Testimony based on these results has been accepted in a local police case and may meet requirements for testimony in U.S. court cases involving gunshots.