Because

isotopes with a short half-life are less dangerous than those with a long half-life.

4. Autoradiography is only suitable for detecting gamma radiation BECAUSE

beta radiation cannot penetrate the gelatin layer of a photographic plate.

Choppin, G.R. and Rydberg, J. (1983) Nuclear chemistry - its theory and applications, Pergamon Press, UK.

Ehmann, W.D. and Vance, D.E. (eds) (1991) Radiochemistry and nuclear methods and analysis, Blackwell Scientific Publications, UK. Knoll, G.F. (1989) Radiation detection and measurement, 2nd edition, John Wiley, UK. Slater, R.J. (ed.) (1990) Radioisotopes in biology - a practical approach, IRL Press, UK.

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