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Please aim for a sealed pressure of less than 2 atmospheres and a flame-sealed tube length of 6-7 inches.Label the with attached tape or paper (tightly attached) or use a permanent black marker to label the ampoule. Potential submitters of graphite should first contact us for details on packing, fees and turnaround time before sending graphite samples to NOSAMS.At the present time, for a 1 milligram sample of graphite, this limiting age is about ten half-lives, or 60,000 years, if set only by the sample size.However, limiting ages or "backgrounds" are also determined by process blanks which correspond to the method used to extract the carbon from the sample.Mark Roberts, staff physicist responsible for CFAMS development, is interested in interdisciplinary application of Accelerator Mass Spectrometry, development of AMS technology, and ion microanalysis techniques.He is working on an initiative to re-determine the Karl von Reden, staff physicist, founding member of the NOSAMS Facility, responsible for the Tandetron AMS operations, is interested in ion source and accelerator modeling calculations and design.Hot samples usually result from inadvertent contamination, like using a container that was previously in contact with radiocarbon tracers.

A fee will be charged for archival of large sample splits.It is expected then, for a 5,570 year (1 half-life) or 11,140 year old (2 half-lives) sample that 125 or 63 counts per second would be obtained.Although one can simply measure older samples for longer times, there are practical limits to the minimum sample activity that can be measured.Generally, as an initial test, we ask for 10 to no more than 15 loose graphite samples in a batch to determine whether we can successfully analyze your graphite.These should all be primary or secondary standards and blanks of known ages. Visually inspect your samples, with a microscope if possible, and remove any material that does not belong.