The characterization of 10B and 6LiF reference deposits by measurement of neutron-induced charged particle reactions — a second campaign

This paper describes the determination of the relative masses or relative areal densities of two new sets of reference deposits, prior to destructive analysis of subsets of these deposits by isotope dilution mass spectrometry and nondestructive analyses by other means. This work is a repeat of a previous effort of about five years ago. The goal of the present work is to improve the accuracy of the results to the level of one part per thousand. Improvements were attempted in several aspects of the measurements. The most significant improvement was realized simply by the increase in the number of repetitions of each measurement. In addition, a more extensive and elaborate data acquisition system was used, and an additional run-to-run monitor was employed to avoid possible problems related to the dependence of the 235U monitor on neutron temperature variations.