21.920b
DATA -
Was: BREAKING NEWS: Found Uran-238 -
Re: Psa 119: Found 18 (61-43) at position 144
(Chandrasekhar limit/grænsemasse)
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Newsgroups:
News:dk.videnskab
Subject: Re: BREAKING NEWS: Found Uran-238 -
Re: Psa 119: Found 18 (61-43) at position 144
(Chandrasekhar limit/grænsemasse)
Date: Sat, 16 Nov 2019 21:42:13 +0100, GMT 20:42
Organization: The Kingdom of Heaven, Department Fools of Christ
21920b1 news:5dd05f36$0$699$14726298@news.sunsite.dk
Background (Baggrundsviden),
Natural Radioactivity (Den Naturlige Radioaktivitet)
https://sites.google.com/site/etbible/home/background/natural-radioactivity/21-920b
https://sites.google.com/site/etbible/home/background/isotopes/k/21-920b
https://sites.google.com/site/etbible/home/background/isotopes/th/21-920b
https://sites.google.com/site/etbible/home/background/isotopes/u/21-920b
https://groups.google.com/d/msg/dk.videnskab/ZPvUl7AEKeA/k77vcWRPAgAJ
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[ ... cut 01 ... ]
DATA:
https://da.wikipedia.org/wiki/Radioaktivitet#Radioaktivitet_i_naturen
Naturlig radioaktivitet
Omkring 15 af de 90 grundstoffer, der forekommer
naturligt på Jorden, indeholder primordial radioaktivitet,
dvs. radioaktive isotoper, hvis halveringstider er så
lange, at væsentlige mængder har kunnet overleve, siden
de blev dannet, formentlig efter en supernovaeksplosion,
og indgik i dannelsen af Solsystemet for 4,6 mia. år
siden.
De største bidrag til Jordens indhold af
radioaktivitet kommer fra ...
kaliumisotopen 40K,
thoriumisotopen 232Th samt de to uranisotoper
238U og
235U.
Hertil kommer aktiviteten af en række kortlivede
døtre i de tre radioaktive henfaldsserier, der begynder
med hhv. ...
232Th (thoriumserien),
238U (uran-radium-serien) og
235U (aktiniumserien)
... og slutter med stabile blyisotoper, hhv. 208Pb,
206Pb og 207Pb.
En fjerde serie,neptuniumserien, begynder med 237Np,
men den har så kort halveringstid, at den ikke mere
findes i naturen.
Den samlede energiproduktion fra naturligt radioaktivt
henfald er i dag ca. 1 mikrowatt/m3 i Jordens skorpe og
ca. 0,02 mikrowatt/m3 i Jordens kappe.
Ved supernovaeksplosionen dannedes også relativt små
mængder af andre radioaktive isotoper med meget kortere
halveringstider, af størrelsesorden få millioner år, fx
26Al, 53Mn, 129I og 244Pu. Disse kortlivede isotoper
bidrog i de første millioner år af Jordens historie til
den indre opvarmning og smeltning, der førte til
adskillelsen i metalkerne og silikatkappe.
Se også ...
isotopgeologi
http://denstoredanske.dk/It,_teknik_og_naturvidenskab/Geologi_og_kartografi/Geokemi/isotopgeologi
=>
Primordial nuclide
https://en.wikipedia.org/wiki/Primordial_nuclide
No._Nuclide_Half-life (years) ...
283 232Th 1.406 × 10^10
284 238U 4.471 × 10^9
285 40K 1.25 × 10^9
286 235U 7.04 × 10^8
Thorium
https://en.wikipedia.org/wiki/Thorium#Isotopes
Isotopes of thorium
https://en.wikipedia.org/wiki/Isotopes_of_thorium
Thorium (90Th) has seven naturally occurring isotopes but
none are stable. One isotope, 232Th, is relatively stable,
Uran-238
https://en.wikipedia.org/wiki/Uranium-238
https://da.wikipedia.org/wiki/Uran-238
Uran-238 (238U) er den mest almindelige af de naturligt
forekommende uranisotoper. Omkring 99,284% af al
naturligt forekommende uran er 238U. ...
Potassium-40
https://en.wikipedia.org/wiki/Potassium-40
Potassium-40 (40K) is a radioactive isotope of potassium
which has a long half-life of 1.251×10^9 years. It makes
up 0.012% (120 ppm) of the total amount of potassium
found in nature.
Abundance of the chemical elements
https://en.wikipedia.org/wiki/Abundance_of_the_chemical_elements
https://en.wikipedia.org/wiki/File:Elemental_abundances.svg
=>
Abundances of the elements (data page)
https://en.wikipedia.org/wiki/Abundances_of_the_elements_(data_page)#Sun_and_solar_system
Sun and solar system
S1 — Sun: Kaye & Laby
Y1 — Solar system: Kaye & Laby
Y2 — Solar system: Ahrens, with uncertainty s (%)
Atom mole fraction relative to silicon = 1.
_______________________S1__________Y1_________Y2
01 H hydrogen 2.8×10^+4 2.8×10^+4* 2.79×10^+4
02 He helium 2.7×10^+3 2.7×10^+3* 2.72×10^+3
26 Fe iron 9.0×10^−1 9.0×10^−1 9.00×10^−1 (2.7%)
19 K potassium 3.7×10^−3 3.8×10^−3 3.77×10^−3 (7.7%)
90 Th thorium 5.0×10^−8 4.5×10^−8 3.35×10^−8 (5.7%)
92 U uranium - 1.8×10^−8 9.00×10^−9 (8.4%)
=>
19-K-40 potassium 3,8×10^−3 * 0,00012 = 4,56 * 10^-7
90-Th-232 thorium 4,5×10^−8 * 1,00000 = 4,5 × 10^−8
92-U-238 uranium 1,8×10^−8 * 1,00000 = 1,8 × 10^−8
Potassium-40
https://en.wikipedia.org/wiki/Potassium-40
Contribution to natural radioactivity
The radioactive decay of 40K in the Earth's mantle ranks
third, after 232Th and 238U, as the source of radiogenic
heat. The core also likely contains radiogenic sources,
although how much is uncertain. It has been proposed that
significant core radioactivity (1–2 TW) may be caused by
high levels of U, Th, and K.[3][4]
Potassium-40 is the largest source of natural
radioactivity in animals including humans. A 70 kg human
body contains about 140 grams of potassium, hence about
0.000117 × 140 = 0.0164 grams of 40K; whose decay
produces about 4,300 disintegrations per second
(becquerel) continuously throughout the life of the
body.[5][6]
Picture:
https://en.wikipedia.org/wiki/File:Evolution_of_Earth%27s_radiogenic_heat.svg
The evolution of Earth's mantle radiogenic heat flow over
time: contribution from 40K in yellow.
Med venlig hilsen,
Mogens Kall, The servant of Michael.
--
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