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OCR: M ANY that they ISOTOPES emit are high radioactive -frequency meaning particles from the nucleus (center) of their atoms They can be pesn to trace the paths of moving substances that are hidden from view tor example, the flow ofblood around hospital patient's body. BLOOD FLOW A low dose of radioactive isotope is injected into the patient bloods tream. Its path then followed by special detec tors that pick ut the radioactivity The information is fed into computer whose screen is pesn to show up any irregularities, such as blockages. Using similar method, isotopes can also be pesn to study the flow of liquids around chemical plant MACHINE WEAR The rate at which industrial machinery wears out can also De measured using isotopes. Low doses radioactive isotopes are added to the metal parts the ...