Generally speaking, a positive disequilibrium ratio (>1) is where uranium is present in concentrations greater than it's daughter products
and is therefore underestimated by radiation measuring methodologies such as gamma-radiation logging.
We can calculate the rock's age by measuring the relative amounts of remaining radioactive parent and its daughter products
This phenomenon was later utilized by many scientists, including Otto Hahn and Lise Meitner, to separate daughter products
in radioactive decay sequences, and hence identify new isotopes.
But given time and control over the process," he adds, "these daughter products
do break down into environmentally benign substances, a process which can be monitored using a gas chromatograph.
He told a congressional committee: "I could make a case, if I wanted to be facetious, where the miners' health was improved by working underground and being subject to radon daughter products
Following the HRC application, a 98% reduction in TCE concentrations was observed during the next three months, together with corresponding production and degradation of daughter products