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However the method is destructive and other radionuclides such as Pb dating can be undertaken by gamma spectrometry technique.30-50g of dried sample is required for analysis using a standard gamma spectrometer or 5g using a Well detector.There is no radiochemical processing required with this technique.The samples are simply packed into petri dishes or vials, left to equilibrate for three weeks and then counted on a High Purity Germanium (HP-Ge) gamma spectrometry system.Sending wet or frozen samples for radiocarbon dating is fine.The lab starts the analyses immediately upon arrival of the sample so moisture will not induce contamination.For such sediment samples, when you date both the sediment and some plant material that is found in the sediment, the dates are usually very similar thus sometimes there is really no humic acid problem to worry about.

Examples of these macrofossils include charcoal, wood, plant, bone, shell, and seeds.

Applications are in the areas of Late Quaternary geochronology, sedimentology and biochronology.

Please discuss your proposal with the appropriate ANSTO Contact Scientist before submitting your proposal as they will assist you in making the correct capability selection.

Most macrofossils can be treated with (1) acid to remove carbonates, and (2) alkali to remove humic acids that might be in the sediment. Sediment and rain water or ground water can move these humic acids up or down through the sedimentary profile bringing carbon that is either younger or older into a sediment layer.

In most cases, humic acids travel downward and make the underlying sediment appear to be younger (sometimes by a small amount, sometimes by a large amount of bias).




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