C Outline the general shielding requirements for energetic B sources D Give

C outline the general shielding requirements for

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half-life of water? (C) Outline the general shielding requirements for energetic B sources. (D) Give examples of two stochastic and two deterministic biological effects of ionising radiation. (E) Describe briefly how to improve the recording efficiency of y-rays and slow neutrons in ordinary photographic films. (F) Why is it necessary for some radiation detectors to have 2-stage amplifier, i.e. pre-amplifier and main amplifier? (G) Illustrate how the isotopic purity of a known radiochemical can be identified. (H) lodine-125, a widely used radionuclide for radioligand assay, has a half-life of 60 days and decays by electron capture. (i) How long will it take for a decay of radioactivity from 1 GBq to 1 MBq? (I) What are the major factors in determining the effectiveness and successfulness of isotope derivative analysis ? (J) Define (i) observed ratio, (ii) concentration factor, and (iii) strontium unit in the context of environmental radioactivity.
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RADIOISOTOPE UNIT: Sc871 01 P.2 2. (A} Describe concisely an experiment to standardize an unknown source by a direct method using coincidence technique. {15 Marks} (B) What are the requirements of the source for the experiment?
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  • Fall '17
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  • Radioactive Decay, Ionizing radiation, University of Hong Kong

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