208Tl and 24Na Gamma Sources for Identifying Soil Water Tagged with Deuterium1
- R. H. Hawkins,
- R. F. Overman and
- J. C. Corey2
In situ tracing of soil water movement with the D2O-24Na method has been limited by the need to reactivate the 24Na gamma source frequently (half-life of 15 hours) in a nuclear reactor. Our laboratory study showed 208Tl produced the same neutron count rates from vials of D2O in dry and moist soil as did 24Na. The 1.9-year effective half-life of 208Tl in equilibrium with its parent nuclide 228Th is a significant advantage of 208Tl over 24Na. Recent commercial availability of 208Tl sources now makes in situ D2O tracing of soil water feasible for investigators not having access to a nuclear reactor.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © .