Lakhasly

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  1. Natural sources : Man is exposed to natural radiation from time immemorial.(c) Internal radiation : Man is also subjected to internal radiation, i.e., from radioactive matter stored in the body These radioactive materials quantities of uranium, thorium, and related substances, and i les on tain is thou in about 2 maraon year on the body as a whole, but may be as high as 70 or 80.Areas exist (e.g., Kerala in India) where there are rock formations containing uranium, it can be as high as 2,000 mrad a year, (ii) Atmospheric radiation: The external radiation dose from the radioactive gases radon and thoron in the atmosphere is rather small : about 2 mrad per year.to approximately 0.1 rad a year.


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  1. Natural sources : Man is exposed to natural radiation
    from time immemorial. Natural background radiation arises
    from three sources : (a) Cosmic rays : The cosmic rays which
    originate in outer space are weakened as they pass through
    the atmosphere. At ordinary living altitudes, their impact is
    about 35 mrad a year. At altitudes above 20 km cosmic
    radiation becomes important. It has been calculated that a
    commercial jet pilot receives about 300 mrad per year from
    cosmic radiation (1). (b) Environmental : (i) Terrestrial
    radiation: Radioactive elements such as thorium, uranium,
    radium and an isotope of potassium (K40) are present in
    man's environment, e.g., soil, rocks, buildings. It is estimated
    that man derives about 50 mrad per year from terrestrial
    radiation. Areas exist (e.g., Kerala in India) where there are
    rock formations containing uranium, it can be as high as
    2,000 mrad a year, (ii) Atmospheric radiation: The external
    radiation dose from the radioactive gases radon and thoron
    in the atmosphere is rather small : about 2 mrad per year.
    (c) Internal radiation : Man is also subjected to internal
    radiation, i.e., from radioactive matter stored in the body
    These radioactive materials
    quantities of uranium, thorium, and related substances, and
    i les on tain is thou in about 2 maraon
    year on the body as a whole, but may be as high as 70 or



  1. All in all, it is estimated that the total natural radiation to
    person is subjected comes. to
    approximately 0.1 rad a year.


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