Table 2 in Fission track dating of obsidian source samples from the Willaumez Peninsula, Papua New Guinea and eastern Australia

Table 2. Results for fission track dating of Papua New Guinean obsidians.1
spontaneousinducedneutronsamplenstrackdensitynjtrackdensityfluenceage±(t)(tcm2)(t)(x104tcm2)(X1015 ncm-2)(a)Baki111729335.541.644±0.01430198±8906Kutau151470945.161.644±0.01426707±7688
1 ns and nj represent the number of spontaneous and induced tracks counted, respectively. The induced track density has been evaluated by means of the population subtraction method. Ages are calculated by using the following constants (Ao; = 1.551 x 1O-lOa·1, 238U/235U = 137.88, O"f = 580.2 b, Af = 7.03 x 1O.17a-1). The thermal neutron fluence is determined from both two calibrated mica and Makrofol detectors in contact with glass dosimeters (Coming CNl, CN2) and two metallic monitors (Co, Au). All corrected ages are weighted means of values in the plateau region.