A Computer P.H.A. System for Real Time off Line Analysis of Spectra from an Aerial Survey for Radioactive Minerals

A system for real time pulse height analysis of ¿ ray spectra recorded on magnetic tape in an aircraft is described. A pulse height to width converter is used to record pulses, whose original amplitudes are proportional to the ¿ ray energies, on magnetic tape. The stored pulse widths are subsequently fed into a Digital Equipment Corporation PDP-9 computer via an interface which digitizes the widths using high speed integrated circuit counting logic.