Measurement of X-ray spectra using a Lu2(SiO4)O-multipixel-photon detector with changes in the pixel number

Abstract

To measure X-ray spectra with high count rates, we developed a detector consisting of a Lu2(SiO4)O [LSO] crystal with a decay time of 40 ns and a multipixel photon counter (MPPC). The photocurrents flowing through the MPPC are converted into voltages and amplified by a high-speed current-voltage amplifier, and event pulses from the amplifier are sent to a multichannel analyzer to measure spectra. We used three MPPCs of 100, 400 and 1600 pixels/mm(2), and the MPPCs were driven under pre-Geiger mode at a temperature of 20 °C. At a tube voltage of 100 kV and a tube current of 5.0 μA, the maximum count rate was 12.8 kilo-counts per second. The event-pulse widths were 200 ns, and the energy resolution was 53% at 59.5 keV using a 100-pixel MPPC.

Çok Amaçlı Foton Sayıcı (ÇAFS) ile 137Cs Gama Spektrumunun Elde Edilmesi

“…Consequently, a different method to acquire a gamma spectrum cleaned by the electronic noise with better resolution by the MPPC was proposed. [2,3], x ışını ve gama ışını ölçümü [4,5], yüksek enerji astrofizik deneyleri [6,7], nükleer tıpta positron emisyon tomogrofisi deneyleri [8,9,10,11] ve kozmik müon dedeksiyonu deneyleri [12,13] için ÇAFS halen artan bir hızla kullanılmaktadır. Bundan dolayı ÇAFS dedeksiyon verimini artıracak her türlü çalışma büyük öneme sahiptir.…”