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A number of subsequent applications of the method (e.g. (Uranium thorium)/helium dating of apatite: experience with samples from different geochemical environments. House et al., 1997; Warnock et al., 1997; Wolf et al., 1997) have illustrated the potential of the technique to provide useful thermochronometric information at temperatures less than 100C. Chemical Geology (Isotope Geoscience Section), 112, 179-191.

By modelling ages through a variety of different thermal history scenarios, it is possible to define the range of histories giving predictions which are consistent with measured ages.

The thermal history framework provided by AFTA forms a solid basis for this procedure.

By incorporating both AFTA and (U-Th)/He ages into the modelling, a more restricted range of thermal history solutions can be extracted. Helium diffusion from apatite: general behaviour as illustrated by Durango fluorapatite.

Several studies suggest that the composition of the apatite does not appear to affect the sensitivity of the He closure temperature (Wolf et al., 1996; House et al., 1999), in contrast to the effect of Cl contents on AFTA annealing kinetics. Journal of Geophysical Research, 105 (B2), 2903-2914.

In principle, therefore, this technique provides a useful supplement to the information provided by AFTA.

represents the alpha-decay constants for the respective isotopes and t is the time over which He has accumulated. Můžete si sami se sebou zahrát malou hru – například že oslovíte alespoň jednoho muže s knírem a jednu ženu se zajímavým účesem nebo šperkem (což může být mimochodem záminka k začátku konverzace).Nejsnadnější je oslovit druhého u baru nebo rautového stolu. Jedna sklenička může pomoci lehce se uvolnit, ale potom už raději brzděte.Přílišná rozjařenost vám může do budoucna zavřít mnohé dveře. Berte si menší kousky a ukusujte malá sousta, která můžete v případě potřeby rychle spolknout.Vyhnete se tak situacím, kdy vás někdo osloví a vy s plnou pusou nebudete moci reagovat. V jeden okamžik se tedy rozhodněte jen pro jídlo, nebo pouze pro pití.Helium is produced within apatite grains as a result of alpha decay from uranium and thorium isotopes, present as impurities at ppm levels. (1994), this process formed the basis of the first attempts at geochronology (Rutherford, 1907a). Rutherford, 1907b) that at least a fraction of radiogenic Helium was lost from the host crystal lattice, and with the advent of apparently more reliable methods of geochronology (e.g.

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