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Biological Effects of Radiation02:59

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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...
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The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
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Thousands of artificial satellites orbit the Earth every day at various distances from the Earth. Satellites that orbit the Earth below an altitude of 1,600 km are considered to be orbiting in low-Earth orbit (LEO). Research satellites and Earth observation satellites are usually placed in LEO, and mostly orbit the Earth in elliptical orbits. Navigation satellites are placed in medium-Earth orbit (MEO), ranging from 2,000 km to 36,000 km from the surface of the Earth. Meanwhile, communication...
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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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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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Space Radiation: The Number One Risk to Astronaut Health beyond Low Earth Orbit.

Jeffery C Chancellor1, Graham B I Scott2, Jeffrey P Sutton3

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Understanding space radiation is crucial for astronaut health. Research using model organisms and "omics" techniques helps develop countermeasures against cancer and CNS effects from galactic cosmic radiation (GCR) and solar particle events (SPEs).

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Area of Science:

  • Space radiobiology
  • Astrobiology
  • Radiation oncology

Background:

  • Space radiation poses significant health risks to astronauts, including cancer, central nervous system (CNS) decrements, degenerative tissue effects, and acute radiation syndrome.
  • Future long-duration missions beyond low Earth orbit (LEO) increase astronaut exposure to complex radiation environments.
  • Current shielding is effective against solar particle events (SPEs) but not galactic cosmic radiation (GCR).

Purpose of the Study:

  • To outline a research vision for space radiobiology.
  • To emphasize the need for understanding space radiation's biological impacts for mission planning.
  • To propose methodologies for developing effective astronaut countermeasures.

Main Methods:

  • Ground-based studies using model organisms to simulate space radiation.
  • Concatenated exposures to proton and heavy ion sources to mimic GCR and SPEs.
  • Integration of 'omics' techniques (genomics, proteomics, metabolomics) with phenotypic observations.

Main Results:

  • Simulated space radiation environments require combined proton and heavy ion exposures.
  • 'Omics' data correlated with phenotypic observations can elucidate radiation effects.
  • This approach aids in understanding risks for long-duration space exploration.

Conclusions:

  • Accurate simulation of the space radiation environment is essential for radiobiological research.
  • Advanced 'omics' technologies are vital for understanding space radiation's impact on human physiology.
  • Personalized radiological countermeasures are key to ensuring astronaut safety on future missions.