Rating radiodating
A review of Radioisotopes and the Age of the Earth
Edited by Larry Vardiman, Andrew A. Snelling, and Eugene F. Chaffin
ICR, El Cajon, CA & CRS, St Joseph, MI, 2000
by Michael Oard
A group of young-Earth researchers called RATE (Radioisotopes and
the Age of The Earth) are investigating
radioactive dating methods and developing alternative young-Earth explanations.
This book is the group’s first major report of its research and findings.
There is no doubt that this is an excellent book. It will be difficult reading for
laymen and most scientists not versed in the methods of radioactive dating. But
what else should we expect from a book on the vanguard of a creationist solution
to old age radiometric dating? The book is well written. To aid the reader with
the terminology, it contains a 90-page glossary. Even then I found a few concepts
that should have been defined in it, such as the ‘nuclear potential well’.
After a prologue by John Morris,
Larry Vardiman introduces the RATE Project, for which the book is only a
preliminary summary. Don DeYoung, in chapter 2,
summarises the radioactive decay equation, the main dating methods, their major
assumptions, and their major problems. He finishes by discussing the possibility
of accelerated nuclear decay, either at Creation, as part of the curse described
in Genesis 3, or
during the Genesis Flood.
John Baumgardner provides a lucid account of geochemical
models of Earth evolution, such as the differentiation of the core and mantle, and
the crust from the mantle. This is the only part of the book I would question because
Baumgardner believes the evidence for these events in the past is overwhelming.
There are probably myriads of evolutionary/uniformitarian assumptions that have
gone into these Earth model deductions. These models and their assumptions need
detailed documentation in the creationist technical literature before we should
accept them. I do agree with Baumgardner that if the evidence for such events in
the past is truly overwhelming, God could have used these processes during the Creation
of the Earth. Towards the end of his article, he describes the very interesting
correlation between high heat flow at the Earth’s surface and the measured
radioactivity—on an outcrop by outcrop level!
Steve Austin describes the three methods of radioactive
dating: 1) the model age, 2) the whole rock isochron, and 3) the mineral isochron.
He breaks new ground by categorizing four types of radioactive discordance. For
the first three types, mainstream geologists have ready answers to dismiss aberrant
dates. However, they have serious trouble with the fourth type where a mineral isochron
is older than the whole rock isochron. When the isotopic data plots
on a straight-line, it is claimed to form an isochron, and validates the initial
isotope quantity and closed system assumptions. However, Austin provides six possible
explanations for such linear plots of daughter versus parent isotopes.
Andrew Snelling produces a comprehensive summary
of the major problems with the main dating methods. Along with Steve Austin, he
has contributed to this literature by dating a number of recent lava flows and obtaining
‘dates’ of millions of years. There is so much contrary data in radioactive
dating that one easily gets the feeling that they have enough unresolved problems
and ad hoc explanations for discordances for one to conclude they are all
unreliable. Throughout chapter 5, he documents that the standard for judging ‘good’
dates is that the dates agree with the expected ‘age’ provided by the
fossils, strata, or even other dating results. This is circular reasoning.
Eugene Chaffin provides theoretical possibilities
for accelerated nuclear decay, which seems to be the main solution the participants
of RATE lean towards. He concludes that the beta-decay mechanism is not well understood
and may provide solutions for the amount of radioactive decay that appears to have
occurred in the past. [See John Woodmorappe’s perspective:
Billion-fold Acceleration of Radioactivity Demonstrated in Laboratory in
the same issue pp. 4–6. Written after this book was published—Ed.]
He also proposes a solution for fission track dating where the number of fission
tracks observed in rocks is more than anticipated for a young world. He suggests
that the excess tracks may be explained by the decay of short-lived fissioning nuclides,
such as super-heavy nuclei.
Russell Humphreys provides a very cogent argument
for the possibility of accelerated nuclear decay in the past. The article becomes
heavy in places, especially in dealing with particle physics and quantum mechanics.
However, the reader who knows little about these subjects, such as me, can still
pick up the main arguments. Humphreys also elaborates on several Scriptural references
to support the idea of accelerated nuclear decay. He gently leads the reader through,
knowing that there will probably be a fair amount of skepticism regarding these
Scriptural references. I found them intriguing.
Andrew Snelling finishes the book with a much needed and extensive review of the
polonium-halo controversy. He adds new information on the previously little-known
geochemistry of polonium. There are still many mysteries associated with polonium
halos.
The book ends with an appendix setting out details of the research proposals resulting
from this initial RATE report. Five proposals are categorised as high priority:
1) helium diffusion experiments in biotite to test accelerated nuclear decay, 2)
mineral isochron studies to test radioisotope dating assumptions, 3) study of the
theoretical mechanisms for accelerated alpha and beta decay, 4) the geological distribution
of polonium radiohalos, and 5) a survey of fission track densities in recent volcanic
tephra.
I highly recommend this book to any creationists, or noncreationists for that matter,
who are interested in the meaning of radioactive dating. There is much already in
the literature, plus unpublished data from mainstream geologists and several of
the participants in RATE, to conclude that the ‘ages’ obtained from
radioactive dating are open to serious question.
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