Free sex chat rooms without id - Cosmogenic dating ppt

Most of those are only produced artificially, and have very short half-lives.For comparison, there are about 254 stable nuclides. Even the lightest element, hydrogen, has a well-known radionuclide, tritium.

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A radionuclide (radioactive nuclide, radioisotope or radioactive isotope) is an atom that has excess nuclear energy, making it unstable.

This excess energy can be used in one of three ways: emitted from the nucleus as gamma radiation; transferred to one of its electrons to release it as a conversion electron; or used to create and emit a new particle (alpha particle or beta particle) from the nucleus.

This complex mixture of radionuclides with different chemistries and radioactivity makes handling nuclear waste and dealing with nuclear fallout particularly problematic.

Radionuclides are used in two major ways: either for their radiation alone (irradiation, nuclear batteries) or for the combination of chemical properties and their radiation (tracers, biopharmaceuticals).

Radionuclides that find their way into the environment may cause harmful effects as radioactive contamination.

They can also cause damage if they are excessively used during treatment or in other ways exposed to living beings, by radiation poisoning.An imaging tracer made with radionuclides is called a radioactive tracer.A pharmaceutical drug made with radionuclides is called a radiopharmaceutical.The degree of harm will depend on the nature and extent of the radiation produced, the amount and nature of exposure (close contact, inhalation or ingestion), and the biochemical properties of the element; with increased risk of cancer the most usual consequence.However, radionuclides with suitable properties are used in nuclear medicine for both diagnosis and treatment.Radionuclides are present in many homes as they are used inside the most common household smoke detectors.

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