Method and Device for Determining 14c in Solid and Liquid Samples

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This patent describes a method and device for determining the amount of carbon-14 (14C) in solid and liquid samples. The process involves decomposing the sample in a sealed vessel using chromic acid, collecting the resulting carbon dioxide (CO2) into a small amount of caustic soda (NaOH) where it is absorbed as sodium carbonate and bicarbonate. The radioactivity (14C activity) in the caustic soda is then measured using a liquid scintillation spectrometer. The invention also covers a specific closed, chemically inert vessel system designed for this process.

Use CasesContent extracted from patent full text and abstract with AI.

• Radiocarbon dating of archaeological or geological samples (solid or liquid)
• Environmental monitoring of radioactive contamination in soil, water, or biological samples
• Quality control in nuclear facilities handling 14C-labeled substances
• Pharmaceutical or biomedical research involving 14C-labeled compounds
• Forensic analysis to detect synthetic or artificially aged materials

BenefitsContent extracted from patent full text and abstract with AI.

• Efficient and simple procedure for determining 14C content in both solid and liquid samples
• Minimizes risk of contamination or sample loss by using a closed, airtight system
• Quick absorption and almost complete collection (>99%) of CO2 within 24 hours
• Reduces sample preparation time and technical complexity compared to traditional methods
• Can handle a variety of sample types including powders, granulates, ashes, and liquids
• Improved safety by containing hazardous chemicals and radioactive materials within the closed vessel
• Accurate and reproducible measurements of radiocarbon activity

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Patent Abstract

The invention relates to a method and device for determining14C in solid and liquid samples. The sample is decomposed and dissolved in a sealed airtight vessel by addition of chromic acid, wherein the resultant CO2 is driven off. The CO2 is completely absorbed from the gas phase in a small amount of caustic soda also located within the sealed vessel (within 24 hours) with formation of Na2CO3 and NaHCO3. The14C activity of the caustic soda is subsequently measured in a liquid scintillation spectrometer.