A Multichannel Pulse-Height Analysis System Utilizing a 35-mm Film Record

Abstract

A system is described for obtaining quantitative amplitude distribution data for events which can be displayed as proportional voltage pulses for visual observation on a cathode-ray oscilloscope. The use of a circuit which intensifies the top of each flattened pulse during display permits photographing the events as dots on a moving 35-mm film at rates of 20 000 per sec or greater. An automatic electromechanical ``reader'' is described which will scan the resulting film and produce a printed record of the number of events in each of 100 discrete ``channels'' with an accuracy comparable to the best available from other ``kicksorting'' schemes. A spectrum of over 500 000 events can be recorded on 100 feet of film.

Decay Characteristics of Some Short-Lived Nuclides of Low Atomic Number

“…reason the frequency divider has an output consisting of two different time intervals is that it is often desirable to allow the last few scalers to count longer than the first 9 in order that long lived background activit,y may be measured more accurately 9 if it is present. The timing equipment is switched from one time base to another by relay RL 10. Notice that it may be connected to an¥ one of the 10 positions of the lower deck of St 3; thus the operator may preset the equipment to change its time base at any one of the positions.…”

Alpha-Particle Ionization Yields in a Gridded Chamber

“…The film was analyzed using a photo-scanning device developed in the Ames Laboratory. 7 The inert gases were purified continuously by passage through chips of a Ca-Mg alloy at a temperature of 470°C. Unpurified tank gases, passed through a cold trap, were used in mixtures.…”

Der Faktor der inneren Umwandlung beim 40 keV-�bergang des 81 208 T1

“…Daraus erhiilt man ftir die Zahl der Konversionsprozesse ,~ = N--N40ke V und ftir N e __ ~?Xr --N40 keV (t) 0~ --?~r40 keV N40 keV Die Quanten wurden mit einem 2 mm dicken NaJ-Kristall nachgewiesen. Die Gesamtzahl der ~berg~nge N ergab sich aus der Anzahl der beim Zerfall des ThC + C' auftretenden c~-Teilchen und dem ThC-Verzweigungsverh~iltnis yon 35,44-0,7% [11] [17] oder einen Einkanaldiskrilninator weiterleiteten.…”