Some radio halo-bearing rocks were found in rocks associated with fossils.Since animals would have been quickly buried and thus fossilized instead of decaying during a Great Flood, it is reasonable to assume the possibility that neutron bombardment may have occurred at the same time as the Great Flood.
In RADIOISOTOPES AND THE AGE OF THE EARTH, Volume II Results of a Young-Earth Creationist Research Initiative edited by Larry Vardiman, Andrew A. Chaffin, Institute for Creation Research, El Cajon, CA and Creation Research Society, Chino Valley, AZ, 2006, these researchers clearly demonstrate that conventional radioisotope nuclear decay dating methods are accurate, with slight (millions of years out of billions of years) contradictions between alpha and beta nuclear decay measurements back to the time of the Biblical flood of Noah's Ark of Mt.
Ararat and to the time of Biblical creation six thousand years ago.
Creation science shows that helium production via radioactive isotope nuclear decay in these same rocks gives a discrepancy of millions to billions of years from conventional radioactive isotope nuclear decay measurements.
In 1982 Robert Gentry discovered high levels of radioisotope nuclear-decay-produced helium in zircons that may or may not have occurred about six thousand years ago.
Other rapid radioactive isotope nuclear decay phenomena discovered in rocks coincide with the time of the Flood carbon dating.
This gives a scenario of rapid decay at the time of creation followed by normal decay rates, and a second radioisotope nuclear decay rate at the time of the Great Flood with a return to normal radioactive isotope nuclear decay rates after the Flood.Results of such errors have continuously showed up in carbon dating, where fresh specimens were dated at thousands of years of age.Creation Scientists have proven that there was a rapid decay of Carbon 14 at the time of the flood.Some of these rocks may or may not have been irradiated at the time of creation or the time of Noah's Ark, depending on whether the assumption that the rocks came from flood areas or other areas is accurate.I don't believe there is any way of knowing how old a rock is, or when it was brought to the surface of the Earth.Rapid radioisotope decay leaves a record in rocks in the form of either fission tracks or radio halos.