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A dental drill or a carborundum paper is used in the pretreatment of shell exteriors.
When the visible contaminants have already been removed, the samples for carbon dating are then reduced in size by an applicable method to increase the surface area before further pretreatment.
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One of the basic assumptions in carbon-14 dating is that the sample being analyzed has undergone only radioactive decay and has remained unaltered by any other process over the years since it ceased interaction with the biosphere. The archaeological artifacts and geological specimens sent to labs for radiocarbon dating are usually found embedded or buried with other materials that may have affected their radiocarbon content.
Any carbon-containing material that affects the carbon 14 content of any given sample is therefore a contaminant.
Learn More Materials such as shells and other materials where a date on the inorganic carbon (carbonate) is to be done typically undergo acid etching before pretreatment.
Learn More The occurrence of contamination can be natural or artificial.
Another physical pretreatment done on samples for carbon dating involves the removal of contaminants by scraping off the exterior layers using the applicable equipment.
Surgical scalpels are used to scrape contaminants off charcoal while dental drills are used on large bones.
Materials such as charcoal, wood, peat, and textiles typically undergo the acid-alkali-acid (AAA) method before radiocarbon dating.
Learn more Materials such as sediments and soils typically undergo acid washes (no alkali) before radiocarbon dating.
Labeling of bone samples with animal glue is an example of artificial contamination.
Other contaminants that may be introduced during sample collection and packaging are biocides, conservation chemicals like polyvinyl acetate and polyethylene glycol, cigarette ash, and labels and wrappers that are made of paper.
The pretreatment method employed depends on the type of sample and the possible contaminants.Tags: Adult Dating, affair dating, sex dating