2014 Les accélérateurs tandem MP en Amérique du Nord sont au nombre de six. Serial § 1. Yale; § 2. Minnesota; § 3. Chalk river; § 4. Rochester; et § 6 et § 7. Brookhaven. L'état actuel et les caractéristiques de fonctionnement de ces six accélérateurs sont discutés. L'augmentation en performance et les améliorations particulières des différentes machines sont examinées et les développements nouveaux apparus depuis la dernière conférence électrostatique sont discutés en détail. Les caractéristiques du fonctionnement au cours de la dernière année pour les différentes machines sont comparées entre elles.Abstract. 2014 The North-American MP Tandem accelerators are six in number. Serial § 1. Yale; § 2. Minnesota; § 3. Chalk river; § 4. Rochester; and § 6 and § 7. Brookhaven. The current status and operating characteristics of these six tandem accelerators will be discussed in the order of their serial numbers. Upgrade and special improvements of the different machines will be reviewed and new developments since the last Electrostatic Conference will be discussed in detail. The overall operating characteristics of the different machines during the last year of operation will be compared.
The Chalk River Tandem Accelerator Mass Spectrometry System has reached a state of reliable measurement of 14C using 2 to 5mg elemental carbon prepared by Mg reduction of CO2. For two comparisons of a near-modern unknown with the NBS oxalic acid standard we obtain a total error of ∼±4.5%, consisting of a random system error of about ±3.5% combined with the statistical counting error. Measurements have been made on 70 samples in 30 days of running time during the past year. Samples included deep rock carbonates, cosmogenic 14C in meteorites, charcoal from earthquake fault zones, collagen of bone artifacts and fossil beetle-fragments.
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