A helium nucleus emitted by some radioactive substances, originally regarded as a ray.
〔物理〕α粒子，阿尔法粒子
Example sentencesExamples
The neutron is a better hammer than the alpha particle for smashing nuclei.
Scientists from a government-funded medical research laboratory at Harwell in Oxfordshire have produced the first direct proof that a single alpha particle emitted by uranium can damage human cells.
The alpha particle is emitted by certain radioactive elements as they decay to a stable element.
A beta particle is an electron that could make it just a little way into the skin, while an alpha particle is a charged helium nucleus that will bounce right off of you.
Because the alpha particle (the helium nucleus) with two protons and two neutrons is especially cohesive, the release of nuclear material is often in this form.
Definition of alpha particle in US English:
alpha particle
nounˈpɑrdəkəl
Physics
A helium nucleus emitted by some radioactive substances, originally regarded as a ray.
〔物理〕α粒子，阿尔法粒子
Example sentencesExamples
The alpha particle is emitted by certain radioactive elements as they decay to a stable element.
The neutron is a better hammer than the alpha particle for smashing nuclei.
Scientists from a government-funded medical research laboratory at Harwell in Oxfordshire have produced the first direct proof that a single alpha particle emitted by uranium can damage human cells.
Because the alpha particle (the helium nucleus) with two protons and two neutrons is especially cohesive, the release of nuclear material is often in this form.
A beta particle is an electron that could make it just a little way into the skin, while an alpha particle is a charged helium nucleus that will bounce right off of you.