Effect of the scintillator on the instability of determination of 32P and 3H + 32P in liquid scintillation spectrometer

1979 ◽  
Vol 44 (7) ◽  
pp. 2196-2201
Author(s):  
Radimír Rexa ◽  
Richard Tykva
Keyword(s):  
Sample Preparation ◽  
Aqueous Solutions ◽  
Counting Rate ◽  
Time Course ◽  
Liquid Scintillation ◽  
Liquid Scintillation Spectrometer ◽  
The Stability

The time course of the changes of the counting rate caused by 32P is determined in six commercially available scintillation mixtures applicable to aqueous solutions of the samples. The measurements were performed separately in the 3H- and 32P-measuring channels. Statistically significant changes were found during the first day after the sample preparation for Unisolve 100, Unisolve 1, and Aquasolve in both counting channels, and for Unisolve ELS in the 3H-channel. Minisolve and Instagel exhibited steady values during 60 and 78 h, respectively, and after that period the changes proceeded very slowly. The stability of the counting rates for Minisolve and Instagel was checked also for 3H alone and for combined 3H + 32P-labelled samples.

Determination of the stability constants for equilibriums involving copper(II) and fluoride ions in aqueous solutions

1974 ◽  
Vol 13 (6) ◽  
pp. 1434-1437 ◽  
Author(s):  
Sidney. Gifford ◽  
Wayne. Cherry ◽  
Joe. Jecmen ◽  
Mike. Readnour
Keyword(s):  
Aqueous Solutions ◽  
Stability Constants ◽  
Fluoride Ions ◽  
The Stability

scholarly journals Balanced-Energy Counting Window for Stable Liquid Scintillation Radiocarbon Dating

Radiocarbon ◽  
2011 ◽  
Vol 53 (2) ◽  
pp. 297-302 ◽  
Author(s):  
Pall Theodórsson
Keyword(s):  
High Precision ◽  
Liquid Scintillation ◽  
Counting Efficiency ◽  
Energy Calibration ◽  
Logarithmic Amplifier ◽  
Before And After ◽  
Linear Amplifier ◽  
The Stability ◽  
Counting Window

This paper describes an optimal radiocarbon counting window for liquid scintillation (LS) 14C dating that secures for unquenched as well as for heavily quenched dating samples maximal stability of 14C counting efficiency and theoretically minimal quench correction. In high-precision dating, a balanced counting window with fixed channel limits is frequently used, where about 3% of the highest part of the 14C spectrum is sacrificed for high 14C counting stability. The stability is, however, diminished for quenched samples. Therefore, this window is here replaced by a balanced fixed-energy 14C counting window where the channel limits depend on the quench level. The LS system used must have a linear amplifier and a multichannel analyzer. All samples are measured at a fixed high voltage. For energy calibration and determination of the quench level, the channel number of the middle of the 59.5-keV peak from an external 241Am gamma source is determined before and after measuring each sample. This counting mode is valuable in high-precision dating. It could be widely applied if adapted to systems with a logarithmic amplifier, generally used in LS dating.

Determination of aluminium-26 using a low-level liquid scintillation spectrometer

The Analyst ◽  
1992 ◽  
Vol 117 (3) ◽  
pp. 435-438 ◽  
Author(s):  
Helge E. Bjørnstad ◽  
Deborah H. Oughton ◽  
Brit Salbu
Keyword(s):  
Liquid Scintillation ◽  
Liquid Scintillation Spectrometer ◽  
Low Level
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