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Related Experiment Videos

Some experimental results on W values for heavy particles

M Chemtob, B Lavigne, J Chary

    Physics in Medicine and Biology
    |March 1, 1977
    PubMed
    Summary

    The average energy loss per ion pair (W value) varies with ion energy and mass in argon and tissue-equivalent gases. These findings are crucial for understanding radiation interactions in different materials.

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    Area of Science:

    • Physics
    • Radiation Science
    • Materials Science

    Background:

    • Understanding the energy deposition of ions is critical in fields like radiation dosimetry and materials science.
    • The average energy required to produce an ion pair (W value) is a fundamental parameter in radiation physics.

    Purpose of the Study:

    • To measure the total ionization produced by ions stopped in argon and tissue-equivalent (TE) gas.
    • To determine the W value for various ions (H+, He+, Ar+, C+, N+, O+) across a specific energy range (25-500 keV).

    Main Methods:

    • Utilized a large ionization chamber, operated as both a proportional counter and an ionization chamber.
    • Measured particle rate and total ionization for ions traversing argon and TE gas.
    • Investigated ions including H+, He+, Ar+ in argon, and H+, He+, C+, N+, O+ in TE gas.

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    Main Results:

    • The W value was found to be dependent on both the energy and mass of the incident ions.
    • For argon, W values ranged from 23.72 eV (25 keV H+) to 63.12 eV (50 keV Ar+), with irregularities observed for He+.
    • For TE gas, W values ranged from 29.13 eV (25 keV H+) to 51.45 eV (50 keV O+).

    Conclusions:

    • Experimental data for TE gas showed good agreement with existing values.
    • Relative variations in argon gas also aligned with previous studies, though absolute values differed, potentially due to gas impurities.
    • The study provides essential data on W values for different ions and gases, contributing to radiation physics understanding.