Automated liquid-scintillation-vial processor

1982 ◽  
Vol 54 (8) ◽  
pp. 1442-1443 ◽  
Author(s):  
Grover D. Owens
Keyword(s):  
Liquid Scintillation ◽  
Scintillation Vial

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.

An Inexpensive Combustion Apparatus for Preparation of Radioactive Samples

Weed Science ◽  
1983 ◽  
Vol 31 (2) ◽  
pp. 159-162 ◽  
Author(s):  
Dennis L. Bucholtz ◽  
F. Dan Hess
Keyword(s):  
Liquid Scintillation ◽  
Low Voltage ◽  
Voltage Transformer ◽  
Combustion Gases ◽  
Plant Parts ◽  
Nickel Chromium ◽  
Combustion Apparatus ◽  
Chromium Resistance ◽  
Scintillation Vial

The combustion apparatus described provides a rapid and inexpensive alternative for measurement of radioisotopes in plant parts. The apparatus utilized a nickel-chromium resistance wire connected to a low-voltage transformer to generate the heat required to ignite the plant tissue. The nickel-chromium wire also served as the sample holder. Combustion was performed in an O2-flushed liquid scintillation vial, and the combustion gases containing either 14CO2 or 3H2O were trapped in situ, scintillant was added, and the vials assayed for radioactivity. The percentage of the radioactivity recovered after combustion was 96.0 for 14C and 93.4 for 3H with standard deviations of 6.8 and 3.0%, respectively.

scholarly journals A Simple and Economical Method for the Radioimmunoassay of Cortisol in Serum

1978 ◽  
Vol 15 (1-6) ◽  
pp. 178-183 ◽  
Author(s):  
R. Morris
Keyword(s):  
Ammonium Sulphate ◽  
Liquid Scintillation ◽  
Sulphate Solution ◽  
Economical Method ◽  
Normal Ranges ◽  
Ammonium Sulphate Solution ◽  
Scintillation Fluid ◽  
Scintillation Vial

Summary A simple, economical method is described for the radioimmunoassay of cortisol in serum. Extraction is avoided by heating the diluted serum to inactivate cortisol-binding globulin. The radioimmunoassay is carried out in a single disposable scintillation vial without centrifugation. Free and bound steroid is separated by partition between ammonium sulphate solution and liquid scintillation fluid. Accuracy, precision and sensitivity are satisfactory. Normal ranges obtained are comparable to those obtained by other radioimmunoassay methods for cortisol.

Assessment of Repellency of Nine Phthalates against Red Imported Fire Ant (Hymenoptera: Formicidae) Workers Using Ant Digging Behavior

2005 ◽  
Vol 40 (4) ◽  
pp. 368-377 ◽  
Author(s):  
Jian Chen
Keyword(s):  
Solenopsis Invicta ◽  
Liquid Scintillation ◽  
Fire Ant ◽  
Red Imported Fire Ant ◽  
Digging Behavior ◽  
Solenopsis Invicta Buren ◽  
And Control ◽  
Imported Fire Ant ◽  
Scintillation Vial ◽  
Behavior Test

Repellency of nine phthalates against red imported fire ant workers, Solenopsis invicta Buren, was evaluated using ant digging behavior. Test compounds included dimethyl, diethyl, dipropyl, dibutyl, dipentyl, dihexyl, diheptyl, dioctyl, and dinonyl phthalates. The active ingredient was incorporated into sand within a liquid scintillation vial with an entry hole on the cap. Fire ant workers dug and removed sand from the vial through the entry hole. The differences in amount of sand removed from the treated and control vials were used to evaluate chemical repellency. Of the 9 phthalates, dimethyl and diethyl phthalates were most repellant to red imported fire ant workers. The minimum repellant concentration within 24 h was 100 ppm for both dimethyl and diethyl phthalates.

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.

TRITIUM RELEASE CHARACTERISTICS OF Al-Li ALLOYS EXAMINED BY LIQUID SCINTILLATION TECHNIQUE

1987 ◽  
Vol 48 (C3) ◽  
pp. C3-541-C3-545 ◽  
Author(s):  
H. SAITO ◽  
Y. ISHIDA ◽  
H. YOSHIDA
Keyword(s):  
Liquid Scintillation ◽  
Tritium Release
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