Other
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47..887r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 47, Issue 5, pp.887-898
Other
44
Scientific paper
Intercalibration of one intralaboratory and three interlaboratory standards used in 40 Ar- 39 Ar dating has been carried out. In order to provide homogeneous values for 40 Ar * / 40 K the standards were prepared by careful handpicking. To control the neutron fluence in the Herald Reactor (A.W.R.E.) 16 aliquots of the standards were arranged along 0.6 × 60 cm of a single silica tube. The corrections for all known interferences from K, Ca, Cl were carefully assessed. Two of the hornblende standards, Hb3gr and MMHb-1 appear homogeneous at the 0.1% level while the other two standards, LP-6 and FY12a are not completely homogeneous. The mean values of 40 Ar * / 40 K when referenced to the previously determined value for Hb3gr (turner et al. , 1971) are: These values are in good agreement with their conventionally determined values. An important correction to 40 Ar * / 39 Ar due to chlorine derived 36 Ar has previously been ignored. It is proportional to the thermal neutron fluence, to the sample ratio of Cl / 40 Ar * , and is a function of time, as neutron produced 36 Cl decays to 36 Ar. This correction is important to certain high-Cl samples when irradiated in reactors with high thermal/fast neutron fluence and corrections of 1. to 2.% may be common. A precise correction factor has been determined, as well as the 36 C1 half life of 2.97 × 10 5 yr.
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