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K-ionization and biological effect.

A Chetioui1, L Guiraud, I Despiney

  • 1Université Paris 7, France.

Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)
|January 1, 1996
PubMed
Summary
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This study links DNA damage to K-shell vacancy production in strategic carbon, nitrogen, and oxygen atoms. A 4% lethal efficiency for K-vacancies quantitatively explains experimental DNA inactivation cross sections.

Area of Science:

  • Atomic and Molecular Physics
  • Radiation Biology
  • Biophysics

Background:

  • DNA is a critical target for radiation-induced damage.
  • Inner-shell ionization of DNA atoms can lead to strand breaks and cell inactivation.
  • Understanding the mechanisms of DNA inactivation by charged particles is crucial for radiation protection and therapy.

Purpose of the Study:

  • To compare experimental DNA inactivation cross sections with K-shell vacancy production cross sections in strategic DNA atoms (C, N, O).
  • To investigate the role of primary particle interactions and secondary electron ionization in K-vacancy production.
  • To evaluate the quantitative contribution of K-vacancies to DNA inactivation via the "K-hypothesis".

Main Methods:

  • Calculation of K-shell vacancy production cross sections for C, N, and O atoms in DNA.

Related Experiment Videos

  • Consideration of ionization and electron capture by primary ions.
  • Inclusion of ionization by secondary electrons, particularly for highly charged and medium-velocity ions.
  • Comparison of K-vacancy production with experimental DNA inactivation cross sections as a function of Linear Energy Transfer (LET).

    • Main Results:

    • A strong similarity was observed between the variations of inactivation and K-vacancy cross sections with LET.
    • Maxima for both inactivation and K-ionization cross sections occur at similar LET values.
    • K-vacancy production maxima correlate with ion impact velocities matching K-electron velocities.
    • Secondary electron ionization is significant for highly charged, medium-velocity ions.

    Conclusions:

    • The "K-hypothesis" provides a quantitative explanation for experimental DNA inactivation cross sections.
    • A 4% mean lethal efficiency can be attributed to ion-induced K-vacancies in strategic DNA atoms (C, N, O).
    • K-shell ionization is a significant, quantifiable contributor to radiation-induced DNA damage and cell inactivation.