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a Geiger ionization chamber contains 60 cubic cm of air and records 500 mR/min. calculate (a). the current produce by the chamber (b). the total number of ion pairs produced per hour of exposure.
please answer, thank you!,

  • physics - ,

    V=60 cm³
    500 mR/min= 500•10⁻³/60 = 8.33•10⁻³ R/s,
    the charge in 1 cm³ is
    q= 8.33•10⁻³•3.33•10⁻¹º =2.78•10⁻¹² C
    in chamber
    Q=2.78•10⁻¹²•60 =1.67•10⁻¹º C
    I=Q/t= 1.67•10⁻¹º A
    1 R produces 2.08 •10⁹ pairs of ions in 1 cm³
    N= 8.33•10⁻³•2.08 •10⁹ = 1.73•10⁷ pairs per second

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