Oxygen Flask Method for the Assay of Tritium-,Carbon-14-, and Sulfur-35-Labeled Compounds

Journal Article · Sat Jun 01 04:00:00 EDT 1963 · Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed.

DOI:https://doi.org/10.1021/ac60200a007· OSTI ID:4691720

Dobbs, H E

Solid samples weighed onto filter paper, and liquid samples injected into gelatin capsules, are burned in an oxygenfilled, round-bottomed, three-necked flask fitted with a rubber vaccine serum cap, After the combustion, which is triggered by an electric discharge, a liquid scintillator is injected into the flask. A liquld phosphor containing water is equilibrated with the radioactive water produced by burning tritiated materials. The gas produced by the combustion of C¹⁴ and S³⁵ compounds is absorbed in liquid scintillator containing phenethylamine. Flushing the liquid phosphors with nitrogen gas, prior to counting, increases the counting efficiency for all three isotopes, and improves the reproducibility of the method for tritiated materials. The counting efficiency of the liquid phosphors is similar after the combustion of most compounds, but reduced efficiencies are observed when azo compounds are burned.

• Research Organization: Atomic Energy Research Establishment, Wantage, Berks, Eng.
• Sponsoring Organization: USDOE
• NSA Number: NSA-17-023263
• OSTI ID: 4691720
• Journal Information: Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed., Journal Name: Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed. Vol. Vol: 35; ISSN ANCHA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
AMINES
CARBON 14
CHEMISTRY
COMBUSTION
EFFICIENCY
ELECTRIC DISCHARGES
GASES
LABELLED COMPOUNDS
LIQUIDS
NITROGEN
PHOSPHORS
SAMPLING
SCINTILLATION COUNTERS
SOLIDS
SULFUR 35
TRITIUM
WATER