Improvements in the energy resolution and high-count-rate performance of bismuth germanate Page: 4 of 15
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are discussed in section 3 below.
S. Improving the energy resolution of B0O
2.1. Cooling BGO
The change in the light output and the decay time of BGO with
temperature is well known froit- previous studies CB, 9, 131. In general, both
the light output and the decay time increase as the temperature of the
scintillator is lowered. However, the change in energy resolution with
temperature has Deen studied very little, and only for very small
scintl1lators. In the present work, the fluoresence decay constant, light
output and energy resolution of several cylindrical BGO scintl1lators (7.6
cm in height and diameter) have been measured as a function of temperature
between *-2* C and -20 C. The three gamma-rays resulting from 22Na and 5*Mn
sources (0.511, 0.834 and 1.27* MeV) were used for the measurements. In
this work only the BGO crystal was cooled directly. Except for the contact
between the cooled BGO and the PUT, the PMT remained at room temperature.
This was done in an effort to keep gain and resolution changes due to the
PMT to a minimum. Qs a further aid in ascertaining the effects of changes
due to the PMT, light from a light-emitting diode (LED) was input to the
PMT as well as into a PIN photodiode. The photodiode output is stable with
time and temperature. In this way, the measured light output and energy
resolution could be corrected for changes due to the PMT. in anticipation
of using the system for high-count-rate situations, the fast (anode) output
of the PMT was used in all the tests to be described below.
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Koehler, P.E.; Wender, S.A. & Kapustinsky, J.S. Improvements in the energy resolution and high-count-rate performance of bismuth germanate, article, January 1, 1985; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1104053/m1/4/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.