Accession Number : AD0428201

Title :   PROMPT ACTIVATION ANALYSIS FOR BORON AND LITHIUM,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s) : Clark,Lincoln ,Jr. ; Rasmussen,Norman C.

Report Date : OCT 1963

Pagination or Media Count : 92

Abstract : Activation analysis for boron and lithium is not possible in the usual sense because neither one becomes radioactive under neutron irradiation. However, both have large thermalneutron cross sections and activation analysis is pos sible if one measures the prompt particles emitted. Based on an analysis of the several types and sources of radiation which would be experienced, including background, a gas-flow proportional counter was used. The device was calibrated by use of aluminum standards containing known amounts of boron or lithium. The difference in the energy spectra makes it possible to determine the relative amounts of these two elements and, in conjunction with the count rate, to find the concentration of each in aluminum. Approximate analyses of aluminum and graphite unknowns were made in the region of one part per million boron plus lithium. An analysis of background effects indicates that the method should be applicable at concentrations which are at least a factor of ten or one hundred lower. (Author)

Descriptors :   (*RADIOACTIVATION ANALYSIS, CHEMICALS), BORON, LITHIUM, THEORY, RADIATION MEASURING INSTRUMENTS, INSTRUMENTATION, STANDARDS, NEUTRON REACTIONS, NUCLEAR ENGINEERING

Distribution Statement : APPROVED FOR PUBLIC RELEASE