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We prefer the 6 mm OD tubes because they tend to crack more cleanly; the 9 mm tubes can hold larger volumes and may be easier to flame-seal, but tend to shatter in the cracker.
We need to know the amount of gas submitted, preferably in µmol, before we can accept CO samples.
» NOSAMS General Statement of C from contamination introduced during chemical preparation, collection or handling.
Organic materials, which require the most processing, are limited to younger ages by their corresponding process blank.
Contamination check samples are prepared in a specially isolated area so as not to (potentially) contaminate samples from other investigators.Hot samples usually result from inadvertent contamination, like using a container that was previously in contact with radiocarbon tracers.Ways to insure clean, uncontaminated samples are discussed in the following document: [Collection and Handling of Samples for Analysis by AMS].Knowing this beforehand will streamline and reduce handling; alternatively leaving this unspecified will delay processing while we seek your decision.A sample with an unnaturally high level of C is sometimes called a "hot sample".