Lakhasly
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- 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.(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.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.It has been calculated that a commercial jet pilot receives about 300 mrad per year from cosmic radiation (1).to approximately 0.1 rad a year.
Original text
- 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
- 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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