Alpha decay is a type of radioactive decay that occurs when an atomic nucleus emits an alpha particle. The alpha particle is composed of two protons and two neutrons, which are bound together and emitted from the nucleus. This process results in the transformation of the original nucleus into a new, lighter nucleus.
Definitions
Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle. An alpha particle is composed of two protons and two neutrons, which are bound together and emitted from the nucleus. This process results in the transformation of the original nucleus into a new, lighter nucleus.
Origin
The phenomenon of alpha decay was first observed by Ernest Rutherford in 1899. He noticed that certain radioactive elements emitted particles that were heavier than beta particles, which had been discovered a few years earlier. Rutherford named these particles “alpha particles” and determined that they were composed of two protons and two neutrons.
Meaning in different dictionaries
According to Merriam-Webster, alpha decay is “radioactive decay in which an atomic nucleus emits an alpha particle.” The Oxford English Dictionary defines it as “the emission of an alpha particle from the nucleus of an atom, resulting in a decrease in atomic number by two and a decrease in mass number by four.”
Associations
Alpha decay is associated with the decay of heavy, unstable nuclei. It is a natural process that occurs in certain radioactive elements, such as uranium and radium. Alpha particles are also used in a variety of scientific and medical applications, including cancer treatment and nuclear power generation.
Synonyms
Synonyms for alpha decay include alpha emission, alpha particle emission, and alpha radioactivity.
Antonyms
Antonyms for alpha decay include beta decay and gamma decay. Beta decay involves the emission of a beta particle, which is an electron or a positron, while gamma decay involves the emission of a gamma ray, which is a high-energy photon.
The same root words
The root words of alpha decay are “alpha,” which comes from the Greek letter alpha, and “decay,” which comes from the Latin word decidere, meaning “to fall off.”
Example Sentences
- Uranium-238 undergoes alpha decay to produce thorium-234.
- Alpha decay is a natural process that occurs in certain radioactive elements.
- Alpha particles are used in cancer treatment to destroy cancer cells.
- Beta decay and gamma decay are alternative forms of radioactive decay.