The decay rates of a sample of a radioisotope of bismuth at different time intervals is indicated in the following table.
(a)(i) Draw a graph of disintegration rate against time.
(ii) Determine the half-life of bismuth. (iii) What would be the effect on the curve if half the amount of sample of bismuth were used. (b) Radioactivity has several applications. State one application of radioactivity in: (i) Medicine (ii) Agriculture (iii) Tracers (iv) Nuclear power station (c) State two dangers associated with radioactivity.
ANSWERS
(ii) It would have no effect on the curve as the quantity of bismuth does not affect half-life.
(b)(i)Applications in medicine Sterilizing surgical instruments. Destroying cancerous tissues during radiotherapy. Provide power to the heart pace setters. (ii) Applications in agriculture Monitor photosynthesis and other related processes. Preservation of foodstuffs, by exposing Micro-organisms to gamma rays. Rate of absorption of a fertilizer by the plant. (iii)Applications in Tracers Detecting leakages in underground water or oil pipes. (iv)Applications in Nuclear power stations. To generate electricity. (d) Dangers of radioactivity Long term exposure causes genetic mutation; Radioisotopes can be used as weapon of mass Destruction; Causes skin cancer; When tested causes environmental pollution.​ ​Related Chemistry Questions and Answers on Radioactivity Form 4 Level
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