In response of the lone nutter challenge by Ken
How can you continue to advance this myth about Guinn’s NAA? Have you read any of the critical analyses of Guinn’s work? How can you still believe Guinn’s NAA "proves" the single-bullet theory to be true?
Dr. Michael Kurtz on Guinn’s NAA test:
On the surface, the neutron activation analysis tests performed by Dr. Guinn provided strong support both for the single-bullet theory and for the contention that the fatal head shot was fired from Lee Harvey Oswald’s rifle. Since the write fragments and Bullet 399 [the alleged "magic bullet" of the single-bullet theory] matched each other, the committee accepted Dr. Guinn’s thesis that they came from the same bullet. Likewise, the committee endorsed the Guinn theory that the head and limousine fragments came from the same bullet.
A more careful analysis of the neutron activation analysis tests, however, shows numerous deficiencies that contest all of Dr. Guinn’s central conclusions. First, of the more than thirty bullet fragments in John Kennedy’s head, only two were subjected to the test. The rest remained embedded in brain tissue and skull bone. That two head fragments matched each other does not mean that others did so. Second, Dr. Guinn did not analyze the large copper fragment found in the limousine. The origin of that fragment, therefore, remains scientifically unproven. Third, Dr. Guinn had previously performed neutron activation analysis on Mannlicher-Carcano ammunition, one of the bullets being from the same manufacture and production lot (Western Cartridge Company, lot 6003) as bullets from Oswald’s rifle. NONE of the bullets matched each other. Moreover, Guinn analyzed pieces of the same bullet, and they, too, failed to match. For example, the four pieces of the bullet from lot 6003 had figures ranging from 7.9 to 15.9 parts per million (ppm.) silver, from 80 to 732 ppm. antimony, and from 17 to 62 ppm. copper. Dr. Guinn himself admitted that "some Mannlicher-Carcano bullets cannot be distinguished from each other."
The most serious shortcoming in Dr. Guinn’s analysis is his failure to properly interpret the data from the assassination fragments. For example, the Connally wrist fragment contained 25 percent more silver and 850 percent more copper than Bullet 399. It also contained 2400 percent more sodium and 1100 percent more chlorine, and it contained 8.1 ppm. aluminum, while Bullet 399 contained none. Similarly, the Kennedy head fragments and limousine fragments contained wide disparities in their chemical composition. Guinn and the committee, therefore, were hardly justified in their conclusions about "matches." (CRIME OF THE CENTURY, pp. 180-181)
You might also read Dr. Ronald F. White’s critique of Guinn’s conclusions in ASSASSINATION SCIENCE, pp. 392-393.