A Simple Method for the Differential Measurement of 125I and 3H by Liquid-Scintillation Spectrometry

1976 ◽  
Vol 51 (5) ◽  
pp. 511-513
Author(s):  
J. H. Shand ◽  
R. C. Noble
Keyword(s):  
Liquid Scintillation ◽  
Low Energy ◽  
Direct Measure ◽  
Liquid Scintillation Spectrometry ◽  
Polyethylene Vial ◽  
Liquid Scintillation Spectrometer ◽  
Simple Method ◽  
Differential Measurement ◽  
Gamma Counter ◽  
Scintillation Vial

1. A method is described for the differential radioactivity counting of 125I and 3H in a liquid-scintillation spectrometer without a separate gamma counter. 2. The sample was contained in a polyethylene miniature vial placed centrally in a standard 20 ml glass scintillation vial containing a tin-loaded scintillant. 3. A direct measure of the 125I radioactivity at an efficiency of 30% was then obtained by radioactivity counting in the pre-set 3H window of a scintillation spectrometer. No counts for 3H radioactivity were registered at this stage because of the barrier to the passage of the low-energy β-particles provided by the wall of the polyethylene vial. 4. After mixing the sample and scintillant both 125I and 3H were detected at efficiencies of 73 % and 29% respectively. Subtraction of the 125I contribution from the combined radioactivity count rate then gave the net 3H count.

Direct Liquid Scintillation Radioassay of14C-Labeled Herbicides in Soil

Weed Science ◽  
1972 ◽  
Vol 20 (3) ◽  
pp. 215-219 ◽  
Author(s):  
T. L. Lavy ◽  
C. G. Messersmith ◽  
H. W. Knoche
Keyword(s):  
Liquid Scintillation Counting ◽  
Liquid Scintillation ◽  
Scintillation Counter ◽  
Soil Samples ◽  
Scintillation Counting ◽  
Liquid Scintillation Spectrometer ◽  
Single Extraction ◽  
Anisic Acid ◽  
Extraction Processes ◽  
Scintillation Vial

A liquid scintillation counting solution was developed which optimized the direct assay efficiencies of14C-labeled 2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine (atrazine), 3,6-dichloro-o-anisic acid (dicamba), and α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine (trifluralin) in soil. In this counting technique, 3-g soil samples containing14C-labeled herbicide were placed directly into a liquid scintillation vial containing a phosphorescent counting solution. Samples were shaken and allowed to settle before assaying using a liquid scintillation spectrometer. This direct radioassay was as efficient or more efficient than double or single extraction processes. Automatic external standardization in conjunction with the liquid scintillation counter was an effective tool for estimating the14C present in soil samples.

Determination of radium isotopes in mine waters through alpha- and beta-activities measured by liquid scintillation spectrometry

1997 ◽  
Vol 222 (1-2) ◽  
pp. 69-74 ◽  
Author(s):  
Nguyen Dinh Chau ◽  
J. Niewodniczański ◽  
J. Dorda ◽  
A. Ochoński ◽  
E. Chrusciel ◽  
...  
Keyword(s):  
Liquid Scintillation ◽  
Liquid Scintillation Spectrometry ◽  
Mine Waters ◽  
Radium Isotopes
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