Zobrazeno 1 - 10
of 43
pro vyhledávání: '"Philip Naysmith"'
Autor:
Stewart P.H.T. Freeman, Elaine Dunbar, Brian G. Tripney, Philippa L. Ascough, Derek Fabel, Pauline Gulliver, Cameron McIntyre, Philip Naysmith, Richard P. Shanks, Sheng Xu
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 535:267-271
Publikováno v:
Radiocarbon. 61:1159-1168
Radiocarbon (14C) dating is routinely used, yet occasionally, issues still arise surrounding laboratory offsets, and unexpected and unexplained variability. Quality assurance and quality control have long been recognized as important in addressing th
Publikováno v:
Radiocarbon. 61:1413-1422
Over the past 30 years, the format of the radiocarbon (14C) intercomparison studies has changed, however, the selection of sample types used in these studies has remained constant—namely, natural and routinely dated materials that could subsequentl
Publikováno v:
Radiocarbon. 61:1293-1304
Each of the laboratory intercomparisons (from ICS onwards) has included wood samples, many of them dendrochronologically dated. In the early years, as a result of the majority of laboratories being radiometric, these samples were typically blocks of
Publikováno v:
Quaternary Geochronology. 43:72-82
Radiocarbon measurement is a well-established, routinely used, yet complex series of inter-linked procedures. The degree of sample pre-treatment varies considerably depending on the material, the methods of processing pre-treated material vary across
Autor:
Sheng Xu, Philip Naysmith, Brian G. Tripney, Gordon Cook, Piotr Jacobsson, Anne Crone, Elaine Dunbar, William Derek Hamilton, Helen Kinch
Publikováno v:
Radiocarbon. 60:219-237
Radiocarbon (14C) wiggle-match dating is a technique with a substantial potential to improve the precision of dating timbers in situations where dendrochronology is not tenable. However, one of the key reasons why obtaining a dendrochronological dete
Publikováno v:
Radiocarbon. 59:1579-1587
Bone is frequently dated in archaeological studies and, especially for very old bones (more than 40,000 years old), it is critical to have an accurate and precise measure of the material-specific background value and its associated uncertainty. The S
Publikováno v:
Radiocarbon. 59:1463-1473
The SUERC Radiocarbon Laboratory employs a one-step “background subtraction” method when calculating 14C ages. An interglacial wood (VIRI Sample K) is employed as the non-bone organic background standard, while a mammoth bone (LQH12) from Latton
Publikováno v:
Radiocarbon. 59:1589-1596
Radiocarbon (14C) dating is used widely in many projects as a basis for the creation and testing of chronological constructs. 14C measurements are by their nature complex and the degree of sample pretreatment varies considerably depending on the mate
Publikováno v:
Radiocarbon. 58:9-23
This paper describes all the major procedures adopted by the Scottish Universities Environmental Research Centre (SUERC) Radiocarbon Dating Laboratory. This includes sample pretreatment, graphite production, accelerator mass spectrometry (AMS) measur