Naslov
Rudjer Bošković Institute radiocarbon measurements IV

Autori
Srdoč, Dušan ; Sliepčević, Adica ; Obelić, Bogomil ; Horvatinčić, Nada

Izvornik
Radiocarbon (0033-8222) 19 (1977), 3; 465-475

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Radiocarbon dating; Archaeology

Sažetak
The following list contains dates of samples measured since our previous list (R, 1975, v 17, p 149-155). As before, age calculations are based on the Libby half-life 5570 ± 30 yr and reported in years before 1950. The modern standard is 0.950 of the activity of NBS oxalic acid. Sample pretreatment, combustion, and counting technique are essentially the same as described in R, 1971, v 13, p 135-140. A new technique was introduced for soil sample preparation (Srdoc Sliepcevic, 1975) consisting of combustion of bulky samples of soil having very low carbon content in a large stainless steel cylinder, heated by an electric oven. The sample is distributed in several dishes ; the total capacity of the furnace is ca lkg of soil per combustion. A stream of purified oxygen flows through the tube and combustion products are trapped in cooled stainless steel traps. Carbon dioxide is subsequently purified by vacuum distillation and condensed in stainless steel cylinders. The synthesis of methane is performed in a similar furnace containing ruthenium catalyst. Statistical processing of data has been computerized (Obelic Planinic, 1975). Sample descriptions were prepared with collectors and submitters. The errors quoted correspond to lo- variation of sample net counting rate and do not include the uncertainty in 14C half-life. Data are not corrected for isotopic fractionation. Ages of speleothems (dripstones) are calculated using 650 (subtracting 3461 yr) and 85% (subtracting 1305 yr), respectively, of NBS standard of contemporary 14C values. The initial 14C content in groundwaters depends namely upon the geology of the catchment area (Munnich & Vogel, 1959 ; Geyh, 1972).

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija, Arheologija

POVEZANOST RADA