Electronic Assassinations Newsletter

Issue #1 "Case Closed or Posner Exposed?"


Appendix B
Results of NAA Testing on Various Bullet Leads

by
Wallace Milam

TABLE II

Uniformity of Antimony, Concentration Among Bullets Taken from Single
Boxes

 
                           No. of Bullets        Antimony Concentration  
         Bullet            Sampled from                     Std. Deviation 
   Caliber     Make        Box     	            Avg. %w         %w 


   0.38        Remington    10                  0.85             +0.02
   0.38        Western      10                  2.59             +0.10
   0.22        Lapua        50                  1.22 (a)         +0.04 
   0.22        Sears        20                  1.26 (a)         +0.03
   0.22        Imperial     20                  0.99             +0.04
   0.22        Peters       20                  0.87             +0.08
   0.22        Remington    20                  0.85             +0.04

   (a) Also found: Sn: 1.04% in Lapua, 0.18% in Sears.
                   Al: 1.09 ppm in Lapua, 1.25 ppm in Sears.

  
Table III
                Norma          Norma
                (Wire)         (Wire)        Remington         Western         
   Sample       Section I      Section II    (Bullet)          (Bullet)

1  (outermost)  5140            5346          1142.1           1138
2               5721            5428          1069.6           1200 
3               5363            5573          1149.8           1195
4               5235            5561          1085.5           1195
5               5500            5651          1155.1           1185
6               5359            5461          1162.1           1155
7               5545            5522          1162.1           1150 
8               5681 (center)   5288          1108.4           1195
9                               5700          1103.6           1163 (center) 
10                              5532          1139.1
11                              5650          1078.5 
12                              5547 (center) 1124.2 (center)

   Avg.         5450            5505           1123.2           1177.1  
   % of value   +3.85           +2.50          + 2.85           +1.98

TABLE II Note the large numbers of bullets sampled from each box, as opposed to the 2-4 sampled by Guinn in his Mannlicher-Carcano tests. Note also the homogeneity of the antimony concentrations, as indicated by the low standard deviations, even when sample weight and not ppm is used in averaging.

TABLE III As many as twelve samples were taken from the cores of several bullets and bullet wires in these 1968 tests. Note that 12 fragments from a 0.38 caliber Western bullet varied only 62 ppm in antimony content. Other 0.38's showed similar figures. This is true homogeneity within a given bullet. Compare with Guinn's figures for "homogeneity" in Mannlicher bullets in Appendix C.

(from "Comparison of Bullet Lead Specimens by Nondestructive Neutron Activation Analysis." Journal of Forensic Sciences, Vol. 16, No.3, pp. 304-305)


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