Results 171 to 180 of about 39,777 (215)
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A liquid xenon proportional scintillation counter
Nuclear Instruments and Methods, 1979Abstract The characteristics of a liquid xenon proportional scintillation counter have been studied by using conversion electrons from 207 Bi. Pulse shapes of the induced charge and the scintillation in the ionization chamber mode were observed and the variations of relative photon yield of the proportional scintillation against the applied voltage ...
K. Masuda +6 more
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Stabilization of photomultipliers in liquid scintillation counters
Review of Scientific Instruments, 1975A special stabilization system has been constructed to control the overall gain of photomultiplier tubes in a liquid scintillation counter. The system uses GaAsP light emitting diodes in the measurement chamber to produce separate reference light pulses for each photomultiplier tube.
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A Liquid Scintillation Counter Using Anticoincidence Shielding
IBM Journal of Research and Development, 1963A liquid scintillation counter with an active volume of one liter is described. The plastic anticoincidence shield reduces background by about 25 percent in the H3 and C14 region. Photomultiplier noise is effectively eliminated by nanosecond coincidence circuitry.
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A whole-body animal counter using a liquid scintillator
Journal of Scientific Instruments, 1967A liquid scintillation counter based on medicinal paraffin is described which has properties which make it suitable for a wide range of animal experiments. It is shown that the counter is relatively insensitive to both the distribution of activity within animals up to the size of large rabbits and to the size of sources for gamma-ray energies of ...
C F, Barnaby, R J, Orton
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Liquid Scintillation Counter Design Parameters
IRE Transactions on Nuclear Science, 1962The development of a liquid scintillation counting system has led to an evaluation of several multiplier phototube types, the comparison of a number of counting chamber surfaces, and an investigation of thermoelectric photocathode cooling. The results obtained, including the more important performance and electronic circuit characteristics of the ...
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The IFIN-HH triple coincidence liquid scintillation counter
Applied Radiation and Isotopes, 2006The paper summarizes the IFIN-HH triple coincidence liquid scintillation counter used for the implementation of the TDCR method. The electronic unit was recently extended to record the three individual double coincidence ratios to take into account the differences in the quantum efficiencies of the three-photomultiplier tubes.
A C, Razdolescu +4 more
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A comparison of instrument performance for six liquid scintillation counters
Analytical Biochemistry, 1978Abstract The counting characteristics of six liquid scintillation counters are compared. Each instrument was tested to determine the figure of merit ( E 2 B ), the change in percentage counting efficiency and external standard ratio over sample volumes from 1 to 20 ml, the reproducibility of chemical quench curves over sample volumes from 5
J F, Patterson +2 more
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Counting C14O2 with a Liquid Scintillation Counter
1963This paper presents a method in which C14 is oxidized to CO2-C14 and the gas is then trapped in an ethanolamine solution of ethylene glycol monomethyl ether. An aliquot of the carbonate solution is added to toluene containing a scintillator, cooled to 0°C, and counted in a liquid scintillation spectrometer.
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Tritium measurements with a new liquid scintillation counter
Nuclear Instruments and Methods, 1973Abstract A new concept in liquid scintillation counting has been employed in developing an instrument for the purpose of quantitatively measuring low specific activity tritium samples. The instrument design differs from present commercial instrumentation in that it utilizes electronics that measure fast-pulse time intervals rather than performing ...
John E. Noakes +2 more
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Analytical Biochemistry, 1960
Abstract A modification of the naphthalene-dioxane-PPO liquid scintillator has been described which will allow up to 3.0 ml of an aqueous solution to be counted. The efficiency of this method in the presence of 1.0 ml water is 65.6% for C 14 and 11.7% for tritiated water. This liquid scintillator has been used to count carbon-14 and tritium in urine,
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Abstract A modification of the naphthalene-dioxane-PPO liquid scintillator has been described which will allow up to 3.0 ml of an aqueous solution to be counted. The efficiency of this method in the presence of 1.0 ml water is 65.6% for C 14 and 11.7% for tritiated water. This liquid scintillator has been used to count carbon-14 and tritium in urine,
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