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Related Concept Videos

Biological Effects of Radiation02:59

Biological Effects of Radiation

All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they produce ions...
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Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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Radiation: Applications01:17

Radiation: Applications

The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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Types of Radioactivity03:23

Types of Radioactivity

The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
Isotopes and Radioisotopes01:28

Isotopes and Radioisotopes

In the early 1900s, English chemist Frederick Soddy realized that an element could have atoms with different masses that were chemically indistinguishable. These different types are called isotopes — atoms of the same element that differ in mass. Isotopes differ in mass because they have different numbers of neutrons but are chemically identical because they have the same number of protons. Soddy was awarded the Nobel Prize in Chemistry in 1921 for this discovery.
An isotope containing more...

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Ionizing radiation and life.

Lewis R Dartnell1

  • 1UCL Institute for Origins, University College London, London, UK. l.dartnell@ucl.ac.uk

Astrobiology
|July 22, 2011
PubMed
Summary

Ionizing radiation, including cosmic rays (CR) and mineral radioactivity, is crucial for life

Area of Science:

  • Astrobiology
  • Planetary Science
  • Origin of Life Studies

Background:

  • Ionizing radiation is pervasive in the cosmos, originating from cosmic rays (CR) and mineral radioactivity.
  • While often studied for its harmful effects, radiation also plays vital roles in habitability and abiogenesis.
  • Previous research has primarily focused on the detrimental impacts of radiation on life and biomolecules.

Purpose of the Study:

  • To review the multifaceted roles of cosmic rays and mineral radioactivity in astrobiology.
  • To explore radiation's influence on planetary habitability, element genesis, and prebiotic chemistry.
  • To examine radiation shielding mechanisms and the effects of rare astrophysical events on life.

Main Methods:

  • Literature review synthesizing current understanding of ionizing radiation's effects.

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  • Analysis of radiation's role in star formation, biogenic element synthesis, and organic molecule production.
  • Examination of planetary shielding and the impact of cosmic events like supernovae and gamma-ray bursts.

    • Main Results:

    • Ionizing radiation is essential for generating habitable environments and driving prebiotic chemistry.
    • Radiation influences star formation, the creation of biogenic elements, and organic molecule synthesis.
    • Planetary shielding protects against radiation, but rare cosmic events pose significant risks; radiation can also support subsurface life.

    Conclusions:

    • Ionizing radiation is a fundamental factor connecting diverse fields within astrobiology.
    • Radiation's dual role—both destructive and generative—is critical for understanding life's origins and persistence.
    • Further research into radiation's complex influences is vital for astrobiological exploration.