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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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NEUROPSYCHIATRIC AND PSYCHOGENETIC ASPECTS OF POST-TRAUMATIC STRESS DISORDERS ASSOCIATED WITH THE CHORNOBYL DISASTER AND THE RUSSIAN-UKRAINIAN WAR: FOCUS ON THE ENDOCANABINOID SYSTEM.

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Cognitive evoked potentials P300 after radiation exposure.

K M Loganovsky1, K V Kuts1

  • 1State Institution National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine, 53 Melnykova Street, Kyiv, 04050, Ukraine.

Problemy Radiatsiinoi Medytsyny Ta Radiobiolohii
|December 28, 2016
PubMed
Summary

Chornobyl cleanup workers exposed to radiation showed impaired brain function, specifically reduced P300 cognitive evoked potential amplitude. This suggests accelerated brain aging and impacts space travel safety.

Keywords:
Chornobyl accidentP300braincognitive evoked potentialsevent related potential (ERP)low doses of ionizing radiationneurocogni tive deficitodd ball paradigmpsychophysiology

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Area of Science:

  • Neuroscience
  • Radiology
  • Cognitive Science

Background:

  • The Chornobyl accident exposed many individuals to ionizing radiation.
  • Long-term effects of radiation on cognitive function require further investigation.
  • Cognitive evoked potentials, like P300, are sensitive indicators of brain activity.

Purpose of the Study:

  • To evaluate brain information processing and cognitive functioning in individuals after Chornobyl irradiation.
  • To assess the relationship between radiation dose and neurophysiological changes using P300.
  • To investigate the long-term impact of radiation exposure on the central nervous system.

Main Methods:

  • Study included 112 male Chornobyl cleanup workers (1986-1987) and 16 unexposed controls.
  • Radiation doses ranged from 0.0002 to 1.23 Gy, with available data from a registry.
  • Cognitive evoked potentials (P300) were used to assess brain function.

Main Results:

  • A radiocerebral effect was observed in Wernicke's area, proportional to radiation dose (threshold ~0.05 Gy).
  • Increased radiation dose correlated with reduced P300 amplitude and increased latency.
  • Significant correlation found between radiation dose and P300 latency increase (>0.5 Gy).

Conclusions:

  • Findings support the hypothesis of CNS radiosensitivity and accelerated brain aging due to ionizing radiation.
  • Results raise concerns about the safety of long-term space flights without adequate radiation protection.
  • Further research and monitoring are needed to identify neurophysiological markers of radiation exposure.