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Chapter 16: Problem 98

Radioactivity is often called ionizing radiation. Why?

Short Answer

Expert verified
Radioactivity is often called ionizing radiation because the emitted radiation in the form of particles (alpha and beta) or electromagnetic waves (gamma) has enough energy to remove electrons from atoms, creating ions. This ionizing process occurs in alpha, beta, and gamma decay, which all contribute to radioactivity being referred to as ionizing radiation.

Step by step solution

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1. Introduction to Radioactivity

Radioactivity is the process where unstable nuclei lose energy by emitting radiation. There are three main types of radioactive decay: alpha (伪) decay, beta (尾) decay, and gamma (纬) decay. Each of these types of decay produces high-energy particles or electromagnetic waves that can interact with other atoms.
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2. Ionizing Radiation Definition

Ionizing radiation refers to any type of electromagnetic waves or energetic particles that have enough energy to remove electrons from atoms or molecules, thereby creating ions. When these electrons are removed, the atom or molecule becomes charged, which can lead to chemical reactions and other interactions.
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3. Alpha Decay and Ionization

Alpha decay occurs when a nucleus emits an alpha particle, which consists of two protons and two neutrons. As these alpha particles travel through matter, their positive charge attracts electrons from surrounding atoms. When an electron is removed, the previously neutral atom becomes an ion, hence the term "ionizing radiation."
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4. Beta Decay and Ionization

In beta decay, a neutron is converted to a proton by the emission of an electron (called a beta particle) or a proton is converted to a neutron by the emission of a positron. Beta particles and positrons can also interact with atoms, either removing electrons to form ions (for beta particles) or combining with electrons to form ions (for positrons). This ionizing process contributes to radioactivity being called ionizing radiation.
05

5. Gamma Decay and Ionization

Gamma decay occurs when a nucleus emits a high-energy photon known as a gamma ray. These photons are a type of electromagnetic radiation, like X-rays and ultraviolet radiation. However, their energy is typically much higher than that of other electromagnetic radiation types. Gamma rays can interact with atoms, removing their electrons and creating ions. This ionizing ability is why gamma decay contributes to radioactivity being labeled as ionizing radiation.
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6. Conclusion

Radioactivity is often called ionizing radiation because the emitted radiation, whether as particles or electromagnetic waves, has enough energy to remove electrons from atoms, creating ions. The ion-producing processes in alpha, beta, and gamma decay all contribute to radioactivity being referred to as ionizing radiation.

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