UNIVERSITY OF HONG KONG BACHELOR OF SCIENCE: FINAL EXAMINATION RADIOISOTOPE UNIT: (87101) RADIOISOTOPE TECHNIQUES IN BIOLOGICAL SCIENCE Date May 8, 1993 9.30 - 11.30 (i) Answer 4 out of 5 questions. Question no. 1 (short answer questions) is compulsory. Start each of the 4 questions on a new page. (ii) Question no. 1 carries 40 marks. Other 4 questions carry 20 marks each. (iii) Candidates may use any self-contained, silent, battery-operated and pocket-sized calculator. The calculator should have numeral-display facilities only and should be used only for the purposes of calculation. lt is the candidate's responsibility to ensure that his calculator operates satisfactorily. (iv) Candidates must record the name and type of their calculators on the front page of their examination scripts. 1. (A) (Time allowed : 2 hours) Comparing red blood cells and nerve cells, which type of cells is more radiosensitive and why? (B) Explain briefly why different types of radiations have different threshold energies for production of Cerenkov radiation. (C) Give 2 major reasons for putting the sample in the liquid scintillation counter for 30 minutes to an hour before the actual counting. (D) Estimate the activity of 24 Na to be injected into a rat of weight 180g to give about 600cpm from a 0.1 g tissue sample when counted 30
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- Ionizing radiation, University of Hong Kong, Scintillation counter