BigP wrote: ↑Thu Dec 12, 2019 6:53 am
Outlaw Yogi wrote: ↑Wed Dec 11, 2019 8:50 pm
BigP wrote: ↑Tue Dec 10, 2019 5:34 am
Outlaw Yogi wrote: ↑Mon Dec 09, 2019 10:22 pm
Juliar wrote: ↑Mon Dec 09, 2019 6:58 pm
The elements are also often found in minerals with thorium and, sometimes, uranium.
I suspected that might be the case .. and suggests from my self taught geology that these RE elements (in tiny traces) would exist in most granite. Granite usually has thorium in it and sometimes still uranium - thorium is decomposed uranium .. eventually it'll decompose to lead.
Lead ? lol
You've found a new friend J ,,
Are you suggesting thorium doesn't decompose to lead? .. or that uranium doesn't decompose to thorium?
If so yer fucken wrong .. but then I've noticed with Kiwis if it wasn't taught in their primary school it isn't true.
Suggest you do a bit of research on chemistry within geology Brainstorm.
Takes eons, but it's reasonably common knowledge that transition metals (elements) all decompose to something else, and in the case of uranium and thorium it eventually becomes lead. And the older the lead the less radioactive it is, and the more absorbent it is of radiation.
C'mon P, validate your condescension ... why don't you give us your version/run-down of events regarding thorium decay?
""Are you suggesting thorium doesn't decompose to lead? "".
Im not suggesting anything Yog, I just found it amusing,
No point in having any thorium in yur pencil if you have nobody to write to
Bullshit yer ignorant git .. can't back pedal after ..
Lead ? lol
I admit I am only partially trained in metallurgy and self taught in geology and chemistry so here's what published texts on the matter have to say.
Penguin Dictionary of Science, revised and updated second edition published 2004.
radioactive decay > radioactivity.
radioactivity The emission of particles or electromagnetic enery from the nucleus of an atom. It was discovered by Antoine Henri Becquerel in 1896,
and many new discoveries , such as the elements radium and polonium, quickly followed. Three types of
radioactive decay occur: > alpha (
a) decay,
> beta (
b) decay, > gamma (
y) decay. Radioactive decay is a first-order process (> order of reaction); as such the decay is exponential,
so a > half life can be tabulated for each radioisotope. when the decay product itself decays, and so on, the sequence of nuclides is known as a
radioactive series. There are several such series in which a succession of decays occurs until a stable nuclide is formed,
typically one of the isotopes of lead.
lead Symbol Pb
thorium Symbol Th. The element with the atomic number 90 and relative atomic mass 232.0. which is one of the > actinides. It is a grey radioactive
metallic solid. Its most common oxidation number is +4 as in the white solid oxide
thoria, ThO2, used in the > Fischer-Tropsch synthesis.
the
thorium series of radioactive decay starts with the nuclide 232Th and ends with 208Pb.
uranium Symbol U.
Penguine Dictionary of Geology Second edition 2001.
radioactive dating See RADIOMETRIC DATING.
radioisotope dating See RADIOMETRIC DATING.
radiometric dating (radioactive dating, radioisotope dating) Techniques of determining the age of rocks or FOSSILS from the relative proportions
of a radioactive parent and its daughter decay product(s). Knowledge of the radioactive decay constant or HALF-LIFE allows the proportion to be converted
into age. Methods include ARGO-ARGON DATING, LEAD-LEAD DATING, POTASSIUM-ARGON DATING, RADIOCARBON DATING, RUBIDIUM-STRONTIUM DATING,
SAMARIUM-NEODYMIUM DATING, THORIUM-LEAD DATING, and URANIUM-LEAD DATING.
lead-lead dating A RADIOMETRIC DATING method based on the proportion of radiogenic 207Pb and 206Pb, the former of which accumulates six times more
rapidly than the latter.
thorium-lead dating A RADIOMETRIC DATING method based on the decay of 232Th to 208Pb with a HALF-LIFE of 13.9 Ga.
uranium-lead age dating A dating method based on the radioactive decay of 238U and 235U to 206Pb and 207Pb respectively with HALF-LIVES of
4498 and 713 Ma. ZIRCON, which contains trace amounts of uranium, is the prefered MINERAL as its primary lead concentration is low and resistant
to uranium LEACHING.
Penguin Dictionary of Chemistry Third edition 2003.
lead, Pb. Metal, at. no. 82, at.mass 207.2 (variable), m.p. 327.46C, b.p. 1749C, density
p 11 350, crustal abundance 14 p.p.m.,
electronic configuration [Xe]4f14-5d10-6s2-6p2. Lead isotopes are the ultimate product of the various radioactive decay series. Occurs naturally as galena,
PbS, and cerussite, PbCO3, which are roasted in air to PbO and recuced to Pb either by the reaction between PbO and PbS (to give Pb plus SO2) or with carbon
or electrolytically. The silvery-white metal is ccp. Lead is used extensively in alloys, in storage batteries (25%), for covering electrical cable, in water
and noise proofing, for lead alkyls, electronic devices, ceramics, pigments, radiation and sound shields, in paints, high-quality glass. Lead compounds are
toxic and hazardous to health.
radioactive decay process Loss od excitation energy as photon. Transfers energy as heat.
radioactive decay series The series of isotopes into which a radioactive nucleus is successfully transformed.
thorium, Th. Radioactive metal, at.no. 90, at.mass 232.04, m.p. 1750C, b.p. 4788C, density
p 11 720, crustal abundance 12 p.p.m.,
electronic configuration [Rn] 6d2-7s2. The most important ores are thorite and thorogummite (silicates), thorianite (ThO2) and monazite
(a mixed phosphate, the principal lanthanide ore). The ores are decomposed with alkali or acid and Th is extracted from acid solution using solvents
such as tributyl phosphate. The metal has been prepared by Ca reduction of ThF4; it is tarnished in air and slowly attacked by hot water and dilute acids;
low temperature ccp, higher temperature bcc. ThO2 was used in the production of incandescent gas mantles; the fissile isotope 233U is obtained from 232Th
and thermal neutrons; ThO2 is an important catalyst (Fischer-Tropsch) and is used in strengthening nickel. The metal is used as an oxygen remover (getter)
in the electronics industry.
uranium, U. At.no. 92, at.mass 238.03, m.p. 1135C, b.p. 4131C, density
p 18 950, crustal abundance 2.4 p.p.m., electronic configuration
[Rn] 4f3-6d1-7s2. Uranium is widely spread in nature (all isotopes are radioactive) and important ores are pitchblende (U3O8), uranite,
carnotite (KUO2-VO4.1.5H2O) coffinite (a silicate) and autunite and torbenite (hydrated double phosphates). Extraction is by flotation, acid extraction
under oxidising conditions, ion exchange, precipitation as hydrated oxide and purification by solvent extraction. The metal is best prepared by
reduction of UF4 with Mg at 700C. The metal is rapidly tarnished in air and attacked by hot water or acids. Both the fissile isotope 235U and the
more common isotope 238U (half-life 4.51 x 10 to power of 9 years) are of importance in nuclear reactions and in the formation of the actinide elements.
Fissile 235U is used in nuclear weapons. The isotopes are separated commercially by gaseous diffusion or centrifugation of UF6.
Uranium is used as an additive in steels, armaments, radiation shields; uranium carbide is a catalyst in the formation of NH3.
And something I didn't know ... according to my science dictionary Lanthanides (rare earths) are in more abundance in nature than iodine ... and I know the oceans are full of iodine because sea food is the best source of it.
Hmm, so BigPusillanimous' learning disability is probably due to the fact during the ice age/s land covered by glaciers sucked all the iodine out of the soil, so unless supplemented by reasonable amounts of sea food the result is defective brain activity.
If Donald Trump is so close to the Ruskis, why couldn't he get Vladimir Putin to put novichok in Xi Jjinping's lipstick?