Alpha Decay of Uranium-238

238U → 234Th + 4He

概要

Uranium-238 emits an alpha particle (helium-4 nucleus) to become thorium-234. This is the first step in the uranium-238 decay series, which ultimately produces lead-206 through 14 decay steps. U-238 has a half-life of 4.47 billion years, roughly the age of the Earth.

参加者

役割 物質 係数 状態
反応物 Uranium U 1 (s)
生成物 Thorium Th 1 (s)
生成物 Helium He 1 (g)

日常の例

Uranium-lead dating of rocks uses this decay to determine the age of geological formations and the Earth itself.

産業上の重要性

U-238はウラン崩壊系列の親核種です。その長い半減期は、数十億年単位の地質学的形成の年代測定に役立っています。

特性

タイプ
Nuclear
可逆的
いいえ
エネルギー
発熱性
ΔH
-410000000.0 kJ/mol

関連する反応

Alpha Decay of Radon-222 Neutron Capture by Uranium-238 Beta Decay of Strontium-90 Beta Decay of Cobalt-60 Beta Decay of Carbon-14 Proton-Proton Chain (Solar Fusion) Uranium-235 Fission Positron Emission of Carbon-11 Positron Emission of Fluorine-18 (PET Scan) Alpha Decay of Radium-226

Frequently Asked Questions

What is the equation for Alpha Decay of Uranium-238?
The balanced equation is: ²³⁸U → ²³⁴Th + ⁴He.
What type of reaction is Alpha Decay of Uranium-238?
Alpha Decay of Uranium-238 is a nuclear reaction.
Is Alpha Decay of Uranium-238 exothermic or endothermic?
Alpha Decay of Uranium-238 is exothermic (releases energy). The enthalpy change (ΔH) is -410000000.0 kJ/mol.