A beam of gamma rays travelling through 4.30×10-3 kg of dry air (at standard temperature and pressure)?

A beam of gamma rays travelling through 4.30×10-3 kg of dry air (at standard temperature and pressure) generates 2.09×1012 ions, each with a charge of +e. What is the radiation dose (in roentgens)? I have absolutely no idea where to start with this.

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  • tigger
    Lv 7
    9 years ago
    Favorite Answer

    The roentgen is an obsolete unit of exposure which is no longer in use. Talk to your teacher about adopting the SI system, which is universally used by scientists and engineers throughout the world. If you are studying scince seriously with a view to taking part in the word-wide scientific community you must get used to using SI units, and the sooner you do so the better.

    The SI unit of exposure is C/kg (coulombs per kilogram), 1 R = 2.58×10−4 C/kg

    Using your data the total charge separated is e*2.09×10^12 C, and the mass is 4.30×10-3 kg so the exposure is 77.87uC/kg

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