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Radiocarbon decays slowly in a living organism, and the amount lost is continually replenished as long as the organism takes in air or food.Once the organism dies, however, it ceases to absorb carbon-14, so that the amount of the radiocarbon in its tissues steadily decreases.Some of the fine details are officially inconclusive (serial numbers were either misrecorded, applied to the wrong batch or the records were lost/destroyed with the old factories).Graham Forsdyke worked with the Singer Company directly to remove some of the errors and fix the anomalies in the old chart records, but some have still been found, especially in the post ET serial number sequences.

The dates given below are the days on which those batches were started, together with the number of machines in each consignment.

The following chart shows the canning code symbols with the year each was used.

It is just to the left of the word "TRADE." This example reads "17 A \". (Answer at the bottom of the page) The code often follows a particular pattern. However, for most cans the date symbol will correspond fairly closely to when the can was actually filled and sold.

Carbon-14 is continually formed in nature by the interaction of neutrons with nitrogen-14 in the Earth’s atmosphere; the neutrons required for this reaction are produced by cosmic rays interacting with the atmosphere.

Radiocarbon present in molecules of atmospheric carbon dioxide enters the biological carbon cycle: it is absorbed from the air by green plants and then passed on to animals through the food chain.

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Carbon-14 has a half-life of 5,730 ± 40 years—, half the amount of the radioisotope present at any given time will undergo spontaneous disintegration during the succeeding 5,730 years.

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