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67champ
2007-Dec-20, 04:19 AM
Is anyone famaliar with Robert Gentry and his work with "Polonium Halos" in granite? Is he for real? Has this been covered here before?


Interesting videos on youtube, search for "Fingerprints of Creation - Polonium Halos"

http://www.youtube.com/watch?v=M_is_h9D1vY

dana t

01101001
2007-Dec-20, 04:27 AM
http://www.talkorigins.org/faqs/po-halos/


"Polonium Haloes" Refuted:
Professional geologist Tom Bailleul takes a second look at Gentry's claimed polonium haloes, arguing that there is no good evidence they are the result of polonium decay as opposed to any other radioactive isotope, or even that they are caused by radioactivity at all. Gentry is taken to task for selective use of evidence, faulty experiment design, mistakes in geology and physics, and unscientific principles of investigation and argument style.
[...]
Evolution's Tiny Violences: The Po-Halo Mystery:
Amateur scientist John Brawley investigated Gentry's claims directly by studying local rock samples, and concluded that there is no good evidence that these "polonium" haloes are actually produced by polonium at all, as opposed to longer-lived radionuclides such as radon or uranium.

Background: Wikipedia: Radiohalo (http://en.wikipedia.org/wiki/Radiohalo)


Radiohalos are microscopic, spherical shells of discoloration in rocks, such as granite, or wood caused by the inclusion of radioactive grains in the rock or by deposition of radioactive material in them. The discoloration is caused by alpha particles emitted by the nuclei; the radius of the concentric shells are proportional to the particle's energy. They have been studied in detail by geologists since the early 1970s, but wider interest was prompted by the claims of creationist Robert V. Gentry that radiohalos in biotite are evidence for a young earth. The claims are contested by the mainstream scientific community as an example of creationist pseudoscience.

Eta C
2007-Dec-20, 05:19 AM
This wouldn't be the first time a "young Earther" mis-interpreted physical evidence.

Nowhere Man
2007-Dec-22, 08:56 PM
That phrase "or wood" bugs me. I traced that article's history back, and "or wood" has been there since day one. Do radiohalos actually appear in wood? Or does the author mean petrified wood?

Fred

01101001
2007-Dec-22, 09:54 PM
Or does the author mean petrified wood?

I'd think coalified wood was meant. That seems to be the "wood" associated with radiohalos, according to Mr Google.

Nowhere Man
2007-Dec-22, 10:40 PM
Hmm. (submits wood radiohalo to Google) Looks like most of the coalified-wood hits are YEC sites. At any rate, the Wikipedia article seems inadequate on the subject of wood radiohalos.

Fred

KaiYeves
2007-Dec-22, 11:14 PM
Polonium sounds like some sort of made up material from a SF movie.

Halcyon Dayz
2007-Dec-23, 04:29 AM
Polonium sounds like some sort of made up material from a SF movie.

As you probably know, polonium was discovered by Marie Sklodowska-Curie and her husband Pierre Curie in 1898.
It was later named after Madame Curie's native country Poland. (Polonia in Latin.)
http://upload.wikimedia.org/wikipedia/commons/3/39/Marie_Curie_%28Nobel-Chem%29.png

Maksutov
2007-Dec-23, 08:35 AM
Is anyone famaliar with Robert Gentry and his work with "Polonium Halos" in granite? Is he for real? Has this been covered here before?


Interesting videos on youtube, search for "Fingerprints of Creation - Polonium Halos"

http://www.youtube.com/watch?v=M_is_h9D1vY

dana tA typical (and a couple decades old) case of a YECer not understanding something and coming to the conclusion that therefore god did it.

The list of these cases would fill a library shelf or a recycle bin.