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The term "beta phase" can refer to different concepts depending on the context. In chemistry and metallurgy, it often describes a specific crystal structure of a metal at a given temperature. For example, beta iron is a nonmagnetic form of iron that exists between 768°C and 910°C, and it has a body-centered cubic (bcc) structure. Some metals, like iron and titanium, can exhibit different crystal structures (allotropes) at different temperatures, with beta (β) being one of these higher-temperature structures.12

In the context of radioactivity, "beta decay" is a type of radioactive decay where a beta particle (an electron or positron) is emitted from an atomic nucleus. This process can sometimes lead to special, rarer beta-decay processes that involve the emission of heavy particles.3

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