Radiocarbon dating

 

Tree ring radiocarbon dating
Radiocarbon dating was used on samples from a three leaf pine tree from Thailand

Radiocarbon dating is a well-known method for determining the age of materials up to the age of  ~ 50,000 years.

 

Radiocarbon dating analyses may be carried out on diverse natural materials such as lake sediments, groundwaters and surface waters, tree-rings, ice-cores, corals, soils and air.

 

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.  

 

 

Capability selections

 

Selecting the right capability depends on your sample type, or the form in which you wish to send the sample.

 

  • C-14 analysis + target preparation from standard treatment - charcoal, shell, bulk sediment, water DIC, water DOC should be selected for routine samples that require simple pre-treatment (e.g. the AAA treatment). Sample such as charcoal, shell and corals, water, peat, sediment and fabrics are included as requiring standard treatments. We will pre-treat the samples, isolate the carbon dioxide and convert it to graphite prior to AMS measurement

 

  • C-14 AMS analysis + target preparation from complex treatment - bone, pollen, holo/alpha cellulose, method development should be selected for samples needing isolation of pollen from sediments, collagen from bone and cellulose from tree- rings which require a more extensive pre-treatment. Collagen from bone also includes stable isotope analysis to ascertain the quality of the bone and of the collagen isolated from the bone. These results are also reported with the final AMS measurement. Bone samples which are deemed to be too degraded for analysis will be returned without further processing

 

  • C-14 analysis + target preparation from CO2 in break seal should be selected when carbon dioxide is sent to ANSTO for conversion to graphite and subsequent AMS analysis

 

  • C-14 analysis of pre-prepared graphite should be selected when you wish to pre-treat and process the sample yourself, and send the graphite target to ANSTO for AMS analysis

 

  • C-14 AMS analysis + target preparation - small sample - to be added, as required, to any of the above selections should only be added for samples which are expected to yield ≤100 µg of carbon after processing. This additional charge which will cover the extra costs involved in the preparation and measurement of these small graphite targets

 

  • C-14 AMS analysis + target preparation from raw rock - quartz (in-situ) should be selected for extraction of in-situ produced 14C from rock, preparation of target and AMS measurement

 

  • C-14 AMS analysis + target preparation from pure quartz (in-situ) should be selected for extraction of in-situ produced 14C from purified quartz, preparation of target and AMS measurement

 

Sample preparation and measurement

 

Radiocarbon dating is performed on a variety of sample types; optimum sample sizes are listed in Table 1 below. For samples such as sediment and DOC in water, the sample size depends on the organic carbon content. Please contact us to discuss these prior to sending samples. 

 

Table 1. Optimum sample sizes for AMS Radiocarbon analysis

Material Quantity Material Quantity
Charcoal 10 - 50 mg Bone (a) 0.5 - 2g
Wood 20 - 30 mg Paper, textiles 10 - 30mg
Cellulose from wood 50 - 100 mg Seeds, leaves 20 - 40mg
Carbonates (shell, coral, stalagmites) 10 - 30 mg Water (DIC) 0.5 - 1L
Sediment (dry) 1 - 3 g Water (DOC) 0.25 - 1L

 (a) The sample size depends on the degree of bone preservation.

 


 

For further information please contact: 

 

Geraldine Jacobsen
Phone: +61 2 9717 9060
geraldine.jacobsen@ansto.gov.au

 

Vladimir Levchenko
Phone: +61 2 9717 3043
vladimir.levchenko@ansto.gov.au

 

David Fink  
Phone: +61 2 9717 3048
david.fink@ansto.gov.au