(Radioactivity Units)
(i) Define the units becquerel (Bq) and curie (Ci) used for measuring the activity of a radioactive source.
(ii) Starting from the definitions given in part (i), show that 1Ci=3.7×1010Bq. State clearly the numerical steps involved.
(iii) Small laboratory sources often have their activities quoted in μCi rather than Ci, whereas large power-reactor sources are expressed in Bq. Explain, with quantitative comparison, why using the prefixes m (milli) or μ (micro) with Ci is convenient for weak sources, while the SI unit Bq is more suitable for very strong sources.