Radioactive decay is the process by which unstable atomic nuclei transform into more stable forms by emitting radiation. This process is spontaneous and occurs at a characteristic rate specific to each radioactive isotope. There are three primary types of radioactive decay: alpha decay, beta decay, and gamma decay, each with distinct characteristics.
Alpha decay involves the emission of an alpha particle, which consists of two protons and two neutrons (essentially, a helium nucleus). This type of decay occurs primarily in very heavy nuclei, which are unstable due to having an excess of both protons and neutrons. When an alpha particle is emitted, the atomic nucleus loses two protons and two neutrons, decreasing the atomic number by 2 and the mass number by 4. As a result, the nucleus transforms into a different element. For example, Uranium-238 undergoes alpha decay to become Thorium-234; in this process, Uranium loses two protons and two neutrons as an alpha particle, changing it to a different element. Alpha particles are relatively massive and carry a double positive charge, which gives them a strong ionizing power, meaning they can easily strip electrons from nearby atoms, causing damage to materials and biological tissues. However, due to their size and charge, they have a short range in matter and are easily stopped by a sheet of paper or even the outer layers of skin.
Beta decay involves the transformation of a neutron into a proton or vice versa within the nucleus, resulting in the emission of a beta particle and another particle called an antineutrino (in the case of electron emission) or a neutrino (in the case of positron emission). There are two subtypes of beta decay: beta-minus decay (or negatron decay) and beta-plus decay (or positron emission). In beta-minus decay, a neutron transforms into a proton, emitting an electron and an antineutrino. This increases the ato....
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