INVESTIGATION FOR POSSIBLE LONG-TERM EFFECTS IN FERRITES FROM HIGH-INTENSITY NEUTRON PULSES
Abstract
Eleven commercial magnetic ferrite types from two companies were investigated for possible long term effects due to exposure to neutron irradiation simulating a nuclear burst. That is, the materials were exposed to very high intensity irradiation (approximately 1O(exp17)n/cm2/sec) for a very short period (a pulse of 80 microseconds at half height). The exposed samples, as well as controls, were measured for magnetic, crystallographic, and resistivity changes. Specific magnetic properties examined were L, Q, B sub m, B sub r, and H sub c, as well as electrical resistivity. The specific crystallographic properties investigated were lattice defect production, redistribution of the metal atoms, and changes in lattice symmetry or size. Magnetic and electrical effects due to ambient temperature, etc., were observed in both control and irradiated cores as random changes. In order to isolate these effects from irradiation effects, special control tests were ultimately required. The random nature of the changes necessitated a statistical approach, as well as maximum precision of measurement. The determination of this precision was thus of prime impcrtance. After determining the magnitude of these miscellaneous effects and subtracting them out, it was concluded that no changes were observed caused by the neutron irradiation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1962
- Accession Number
- AD0400743
Entities
People
- G. C. Sands
- J. Newberg
- W. W. Malinofsky
Organizations
- United States Army Communications-Electronics Command