“alpha particle”的概念、定义、翻译、参考文献-科学参考

alpha particle

Physics

A helium–4 nucleus emitted by a larger nucleus during the course of the type of radioactive decay known as alpha decay. As a helium–4 nucleus consists of two protons and two neutrons bound together as a stable entity the loss of an alpha particle involves a decrease in nucleon number of 4 and decrease of 2 in the atomic number, e.g. the decay of a uranium–238 nucleus into a thorium–234 nucleus. A stream of alpha particles is known as an alpha-ray or alpha-radiation.

Astronomy

The nucleus of a helium-4 atom. It consists of two protons and two neutrons and hence is positively charged. Alpha particles are emitted by the nuclei of atoms in a process of radioactive decay known as alpha decay.

Chemistry

A helium nucleus emitted by a larger nucleus during the course of the type of radioactive decay known as alpha decay. As a helium nucleus consists of two protons and two neutrons bound together as a stable entity the loss of an alpha particle involves a decrease in nucleon number of 4 and decrease of 2 in the atomic number, e.g. the decay of a uranium–238 nucleus into a thorium–234 nucleus. A stream of alpha particles is known as an alpha-ray or alpha-radiation.

Chemical Engineering

A positively charged particle emitted by various radioactive materials such as uranium during radioactive decay. The particle consists of two neutrons and two protons, and is therefore identical to the nucleus of a helium atom. The result of this radioactive decay is that the original element is gradually converted into another element with a decreased atomic number and mass. Alpha particle emissions, or alpha decay may occur at the same time as beta decay. It can be stopped by a sheet of paper and is harmful to humans only if the substance emitting the alpha particles is ingested, inhaled, or enters the body through wounds.

单词	alpha particle
释义	alpha particle Physics A helium–4 nucleus emitted by a larger nucleus during the course of the type of radioactive decay known as alpha decay. As a helium–4 nucleus consists of two protons and two neutrons bound together as a stable entity the loss of an alpha particle involves a decrease in nucleon number of 4 and decrease of 2 in the atomic number, e.g. the decay of a uranium–238 nucleus into a thorium–234 nucleus. A stream of alpha particles is known as an alpha-ray or alpha-radiation. Astronomy The nucleus of a helium-4 atom. It consists of two protons and two neutrons and hence is positively charged. Alpha particles are emitted by the nuclei of atoms in a process of radioactive decay known as alpha decay. Chemistry A helium nucleus emitted by a larger nucleus during the course of the type of radioactive decay known as alpha decay. As a helium nucleus consists of two protons and two neutrons bound together as a stable entity the loss of an alpha particle involves a decrease in nucleon number of 4 and decrease of 2 in the atomic number, e.g. the decay of a uranium–238 nucleus into a thorium–234 nucleus. A stream of alpha particles is known as an alpha-ray or alpha-radiation. Chemical Engineering A positively charged particle emitted by various radioactive materials such as uranium during radioactive decay. The particle consists of two neutrons and two protons, and is therefore identical to the nucleus of a helium atom. The result of this radioactive decay is that the original element is gradually converted into another element with a decreased atomic number and mass. Alpha particle emissions, or alpha decay may occur at the same time as beta decay. It can be stopped by a sheet of paper and is harmful to humans only if the substance emitting the alpha particles is ingested, inhaled, or enters the body through wounds.
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