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Chapter 15: Problem 3

What is a radioactive substance?

Short Answer

Expert verified
A radioactive substance is an unstable material that emits particles or energy in a process known as radioactive decay to achieve a more stable atomic configuration. Examples include uranium, plutonium, and radon.

Step by step solution

01

Definition

A radioactive substance refers to materials that are unstable at the atomic level, typically resulting in the emission of particles or energy as the atoms decay.
02

Characteristics

Radioactive substances are characterized by a spontaneous process known as radioactive decay, which involves the emission of particles or energy to achieve a more stable atomic configuration.
03

Examples

Examples of radioactive substances include uranium, plutonium, and radon.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Radioactive Decay
Radioactive decay is a naturally occurring process where unstable atomic nuclei lose energy by emitting radiation. This transformation allows the atom to reach a more stable state. The type of radiation emitted can include alpha particles, beta particles, or gamma rays. The rate at which radioactive decay occurs is measured in half-lives, which is the time required for half of the radioactive atoms in a sample to decay. Radioactive decay is crucial in fields like geology, for dating materials, and medicine, for imaging and treatment applications. Understanding this process is important for managing nuclear waste and harnessing nuclear energy.
Unstable Atoms
Atoms are composed of protons, neutrons, and electrons. In unstable atoms, there is an imbalance in the number of neutrons compared to protons. This imbalance creates instability, causing the atom to seek a more balanced state through radioactive decay. The term 'unstable' is often synonymous with radioactive. This instability means that the atom is in a constant state of change until it reaches a stable form. The journey of an unstable atom can include the emission of particles and changes in nuclear structure, leading to different elements over time.
Uranium
Uranium is a heavy metal, with the chemical symbol U and is naturally radioactive. It is well-known due to its use as a fuel in nuclear power plants. Uranium atoms have large nuclei that can easily become unstable, prompting radioactive decay. There are three isotopes of uranium that occur naturally: uranium-238, uranium-235, and uranium-234, but only uranium-235 is directly useful for nuclear energy applications due to its ability to sustain chain reactions. Uranium's radioactivity is also harnessed for nuclear weapons, making its management crucial for national security and environmental safety.
Plutonium
Plutonium is an artificial element with the symbol Pu, and it is well-known for its use in nuclear weapons and as a fuel in nuclear reactors. It is typically produced in nuclear reactors from uranium-238 through a series of nuclear reactions. Plutonium has several isotopes, with plutonium-239 being the most significant for its capability to sustain a nuclear chain reaction. Handling and storing plutonium requires stringent safety measures due to its long half-life and high radiotoxicity. Besides its applications in energy and defense, plutonium is a material of concern due to its potential environmental and health hazards if not controlled properly.
Radon
Radon is a colorless, odorless, and tasteless radioactive gas, resulting from the natural decay of uranium in soil and rocks. Designated by the symbol Rn, this element poses significant health risks as it can accumulate indoors in homes and buildings, particularly basements. Inhaling radon gas over time increases the risk of lung cancer, making it essential to ensure buildings are well ventilated and tested for radon levels. Originating from the Earth's crust, radon is part of the natural background radiation we are exposed to every day. However, concentrated exposure can be mitigated through proper construction practices and regular testing.

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