Flate Series, Vaksdal Marine Shells from +40 to 45M in Flate, Trengereid, Vaksdal (60° 26' N, 5° 35' E)
Trondheim Natural Radiocarbon Measurements VII Item Type Article; text Authors Gulliksen, Steinar; Nydal, Reidar; Lövseth, Knut Citation Gulliksen, S., Nydal, R., & Loevseth, K. (1975). Trondheim natural radiocarbon measurements VII. Radiocarbon, 17(3), 364-395. DOI 10.1017/S0033822200059865 Publisher American Journal of Science Journal Radiocarbon Rights Copyright © The American Journal of Science Download date 02/10/2021 11:44:52 Item License http://rightsstatements.org/vocab/InC/1.0/ Version Final published version Link to Item http://hdl.handle.net/10150/652509 [RADIOCARBON, VOL. 17, No. 3, 1975, P. 364-395] TRONDHEIM NATURAL RADIOCARBON MEASUREMENTS VII STEINAR GULLIKSEN, REIDAR NYDAL, and KNUT LOVSETH Radiological Dating Laboratory, The Norwegian Institute of Technology, The University of Trondhelm, Norway INTRODUCTION Most dates in this list were obtained in the period 1970 to 1972. Treatment of samples and counting equipment have remained essentially the same as described previously (R, 1972, v 14, p 418-419). Counting equipment and improvements are described in more detail by Gulliksen (1972). Our counters 2, 5 and 6 now have backgrounds/re- cent standard net counts of respectively .8cpm/ 19.3cpm, l.lcpm/ 11.7cpm, and .55cpm/7.6cpm. Guard Counter GM3 (Nydal, 1965) shielding our Counter 2, has been continuously working for 3 years without refilling or purification of the propane counting gas (1.2atm). Gyttja samples are now dated by using the NaOH-soluble fraction whenever the quantity of sample material is sufficient. Ages are calculated by applying the Libby value 5570 ± 30 years, for the 14C half life, and using 95% of NBS oxalic acid activity as contem- standard referring to AD 1950.
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