Sample Submission & Reporting
BEFORE sending samples so we can confirm availability of our service, the likely turnaround time and costs and provide the necessary documentation needed to send samples to us. We will NOT commence any processing without receipt of a completed Submission Form.
- How to Send Samples
- Sample Types and Requirements
- Sample Sizes
- Make Payments
- Terms and Conditions
Please contact us before sending samples. We will provide the following documents and confirm the likely turnaround time and costs for your submission.
Sample Submission Form: All samples should be accompanied by the Sample Submission Form with sufficient documentation to identify each individual sample. This would include the nature of the sample material, full name and contact details of the submitter and where applicable additional information for the purposes of invoicing e.g. Order numbers
Treatment History: Details of any prior treatment of the sample, such as cleaning, drying, treatment with solvents or preservatives, or any repair work should also be supplied. The relevant information can be supplied via our Sample Submission Form, or copy can be emailed or faxed to you on request.
MPI Import Permit: Samples sent from outside New Zealand must be accompanied by a copy of the Import Permit. Failure to do this may result in your samples being delayed on entry into New Zealand. Do not send your samples without the permit.
Other Permits: Materials such as ivory or coral are covered by the CITES Agreement (Convention on International Trade in Endangered Species). New Zealand is a signatory to the agreement, and sample materials covered by CITES must show an exemption code on the packaging. We can supply you with the appropriate code on request to facilitate the importing of the samples to New Zealand, but you are responsible for arranging the necessary permit to export the sample from the country of origin.
2. How to Send Samples
Use courier or registered post: Trackable courier despatch or registered post is recommended and samples are acknowledged on receipt by us. Couriers commonly used include DHL and Federal Express but also consider your postal services as they usually have fixed price postage Priority or Express Mail International tracked envelopes or boxes allowing up to some maximum weight. If courier firm insists on a value for the contents use $1.00.
Sample Submission Form: Email completed submission form to email@example.com as an Excel file, also include a hard copy with the samples.
MPI Import Permit: Print the MPI Import Permit and include with the samples, Write down the MPI permit number on package. Required for all sample sent from outside New Zealand.
Label package as: "Samples for destructive Scientific Analysis - no commercial value".
Contact phone number for courier packages: +64 4 570 4637
Address to send samples to:
Rafter Radiocarbon Laboratory
National Isotope Centre
30 Gracefield Road, Gracefield
Lower Hutt 5010
3. Sample Types and Requirements
Send dry samples where possible.
Bacterial activity in wet samples can affect the final 14C age. Use a low temperature oven which has never been used for radioisotope experiments. Cover samples with lightly perforated foil and heat at a temperature of at least 40°C till dry.
Sending groundwater samples.
Please download GroundwaterInfo2014.pdf 20.84 kB
Original material for full laboratory processing. Our sample preparation laboratory is experienced in handling a wide range of materials. We can advise you on the suitability of particular types of materials for radiocarbon dating, and we will be happy to discuss with you the most suitable way of taking a sample and packaging it to send to our laboratory.
Prepared samples ready for combustion. For some types of samples, submitters who have access to chemical laboratories may wish to carry out their own pre-treatment procedures and submit the samples to the radiocarbon laboratory ready for combustion. Samples submitted as “pre-prepared” incur lower costs, but the client must acknowledge that we are not responsible for any contamination introduced into the sample due to laboratory procedures outside our control. For this reason, we request anyone planning to submit pre-prepared samples to contact the laboratory in advance so we may review the planned sample preparation procedure for any possible sources of 14C contamination.
Clean CO2 gas sent in break-seal tubes. We can accept 6mm and 9mm outer diameter sealed pyrex or quartz tubes between 16 and 20cm in length. The preferred amount of CO2 is approximately 2mg of Carbon or 4mls of CO2 at STP. For alternate tube sizes up to 15mm outer diameter please contact us. Some ideas for packaging for shipping include placing wrapped tubes inside rigid plastic tubing e.g., polythene piping. Taping the tubes to bubble wrap at regular intervals and rolling into a cylinder is another option. This can then be placed into a solid cardboard mailing tube or a rigid cardboard box.
Graphite, ready for pressing into cathodes or already pressed in SNIC-MS cathodes for insertion into the AMS wheel. We can advise on the best way of sending the graphite or cathode. Generally, it is advisable to send some test samples first, to ensure that your graphite will give a satisfactory output in our ion source. Guidance on how to populate the 40 position SNICS wheel with unknowns, blanks and standards can be found here Graphite submitters population of SNICS 40 wheel.pdf 123.85 kB
4. Sample Sizes
Ideally, samples should yield 1mg of carbon after processing, and the corresponding amounts of sample material are typically as follows:
|Bone||150 - 3000mg, (Depending on condition)|
|Charcoal||10 - 50 mg.|
|Peat||100 - 1000 mg (Depending on carbon content)|
|Sediments||1 - 3 g (Depending on carbon content)|
|Shell & forams||10 mg|
|Wood, cellulose||50 - 300 mg|
The minimum quantity for our standard measurement is 0.2mg of graphite. Samples less than 0.2mg graphite are known as "small" samples. Down to 0.05mg of graphite may be measured, but the precision of the results will suffer as a consequence, the reporting time will be >8 weeks (up to 16 weeks) and the price will be greater (a 30% surcharge will apply and also charges for partial processing should samples be withdrawn). Pleasecontact us for advice. We would contact you before completing processing should it become clear that the sample will realise <0.2mg graphite.
Peats and Sediments - The carbon content of peats and sediments can vary greatly. 90 mg of a peat which has a 10% organic carbon content would yield sufficient material for dating, while a sediment which is only 0.1% organic carbon might require almost 9 grams. If you are unsure of the carbon content of your sample, please contact the laboratory before submitting so we may discuss size and treatment procedures which vary depending on the fraction you wish to date.
- Results are usually reported 12 weeks after receipt of samples subject to the complexity of processing and laboratory workloads (regular size samples requiring full processing).
- Reporting time may be longer if batches of more than ten samples are submitted or if the nature/size of the material is such that special processing/measuring methods are required.
- Quicker turn-around at higher cost might be available on request, subject to laboratory workloads. Contact us to check the availability of this service should you be interested.
What's in the report:
- δ13C (see note at foot of Sample Processing page)
- Conventional radiocarbon age, fraction modern (defined by Donahue et al. 1990, without a decay correction) and Δ14C (as defined by Stuiver and Polach 1977, with a decay correction). Note we only report Δ14C if a date of collection, or other date to apply the decay correction to, is provided, since otherwise it is a meaningless value.
- We don't usually report pMC, as there is some confusion in the literature as to how pMC is calculated (see Glossary for how to calculate pMC)
- Where applicable, calibrated ages based on published international calibration data sets
Our prices include reporting as detailed below but not interpretation. Charges for interpretation services are additional and based on a per hour basis.
The total error reported for radiocarbon ages includes counting statistics and instrumental error. For ages less than 10,000 years the error is typically ± 25 years or less (for regular size samples > 0.2mg graphite).
A high precision premium charge service offering reduced error may be available. Please contact us for details.
6. Make Payments
Information on payment methods is available here to download for reference:
7. Terms and Conditions
The following Terms and Conditions apply to all work undertaken by Rafter Radiocarbon Laboratory, GNS Science.