翻訳と辞書
Words near each other
・ Trace fossil
・ Trace fossil classification
・ Trace Gallagher
・ Trace gas
・ Trace heating
・ Trace identity
・ Trace inequalities
・ Trace Junction, West Virginia
・ Trace Lake
・ Trace metal
・ Trace Metal Detection Test
・ Trace mineral analysis
・ Trace monoid
・ Trace of Stones
・ Trace operator
Trace radioisotope
・ Trace scheduling
・ Trace State Park
・ Trace table
・ Trace theory
・ Trace tree
・ Trace Urban
・ Trace vector decoder
・ Trace VFX
・ Trace Zero Cryptography
・ Trace, West Virginia
・ Trace-based simulation
・ Traceability
・ Traceability matrix
・ Traceability of genetically modified organisms


Dictionary Lists
翻訳と辞書 辞書検索 [ 開発暫定版 ]
スポンサード リンク

Trace radioisotope : ウィキペディア英語版
Trace radioisotope
A trace radioisotope is a radioisotope that occurs naturally in trace amounts (i.e., extremely small). Generally speaking, trace radioisotopes have half-lives that are short in comparison to the age of the Earth, since primordial nuclides tend to occur in larger than trace amounts. Trace radioisotopes are therefore present only because they are continually produced on Earth by natural processes. One exception to this rule is plutonium-244 which, with a half-life of about 80 million years, is just barely stable enough that some of it has remained from the Earth's formation. Natural processes which produce trace radioisotopes include cosmic ray bombardment of stable nuclides, ordinary alpha and beta decay of the long-lived heavy nuclides, thorium-232, uranium-238, and uranium-235, spontaneous fission of natural uranium-238, and nuclear transmutation reactions induced by natural radioactivity, such as the production of plutonium-239
〕 and Uranium-236〔http://esarda2.jrc.it/references/Technical_sheets/ts-mass-spectrometry-071212.pdf〕 from neutron capture
〕 by natural uranium.
==Elements==
The elements that are created only from decay are listed below.
Isotopes of other elements:
*Tritium
*Beryllium-7
*Beryllium-10
*Carbon-14
*Fluorine-18
*Sodium-22
*Sodium-24
*Magnesium-28
*Silicon-31
*Silicon-32
*Phosphorus-32
*Sulfur-35
*Sulfur-38
*Chlorine-34m
*Chlorine-36
*Chlorine-38
*Chlorine-39
*Argon-39
*Argon-42
*Calcium-41
*Iron-60

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Trace radioisotope」の詳細全文を読む



スポンサード リンク
翻訳と辞書 : 翻訳のためのインターネットリソース

Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.