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Related Experiment Videos

Recent experimental results on W-values for heavy particles.

V D Nguyen, M Chemtob, J Chary

    Physics in Medicine and Biology
    |May 1, 1980
    PubMed
    Summary

    The average energy loss per ion pair (W-value) in nitrogen, methane, and carbon dioxide was measured for various ions. W-values depend on ion velocity, with the Bragg additivity formula showing good agreement for tissue-equivalent gas.

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    Area of Science:

    • Physics
    • Atomic and Molecular Physics
    • Radiation Physics

    Background:

    • Understanding energy deposition by ions is crucial for radiation dosimetry and detector design.
    • Previous measurements of W-values have shown dependencies on gas composition and ion properties.

    Purpose of the Study:

    • To measure the total ionization produced by various ions stopping in nitrogen, methane, and carbon dioxide.
    • To determine the average energy loss per ion pair (W-value) for these ions and gases.
    • To investigate the velocity dependence of W-values and test the Bragg additivity formula.

    Main Methods:

    • Utilized a previously described chamber operated as both a proportional counter and an ionization chamber.
    • Measured particle rate and total ionization for ions (H+, He+, C+, N+, O+, Ar+) in the energy range of 25-375 keV.

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  • Performed statistical analysis of data repeated 20-40 times for each condition.

    • Main Results:

    • Determined W-values for ions stopping in nitrogen, methane, and carbon dioxide, with systematic errors of +/- 2.5%.
    • Observed a clear dependence of W-values on the velocity of incident ions.
    • Reported specific W-value ranges for different ions and gases, e.g., 35-84 eV in nitrogen, 30.3-66.4 eV in methane, and 33.4-135.9 eV in carbon dioxide.
    • Found the Bragg additivity formula to be within 2% agreement for tissue-equivalent gas, except for 25 keV O+ (10% discrepancy).

    Conclusions:

    • The W-value is significantly influenced by ion velocity.
    • The Bragg additivity formula provides a reasonable approximation for W-values in tissue-equivalent gases.
    • Experimental W-values are essential for accurate radiation energy deposition calculations.