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Without radioactivity would not be significant advances in medicine and industry. Our daily life would be very different.
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X-rays would not exist, and medicine could not be used radiography as an aid in diagnosis.
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Many people could not be cured by chemotherapy.
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If we did not understand radioactivity, we could not use nuclear energy.
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Computed tomography would not have invented, then could not get sections of anatomical objects diagnostic purposes.
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It would not have been possible positron emission tomography.
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The industry could not use radioactive isotopes to measure the thickness of sheets of paper, plastic and other materials.
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Radioactive isotopes could not be used for sterilization of food.
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The radioactive isotopes could not be used to understand internal composition of various materials
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Science would not have the human genome sequence, which provides valuable information on DNA.