592 PArt | IV Electrical and Radiation Measurements Ensminger, d., Ultrasonics, Marcel dekker, New York (1973). Erf, R. K., Holographic Non-destructive Testing, Academic Press, London (1974). Farley, J. M., et al., "developments in the ultrasonic instrumentation to improve the reliability of NdT of pressurised components," Conf. on in-service inspection, institution of Mechanical Engineers (1982). Filipczynski, L., et al., Ultrasonic Methods of Testing Materials, Butter- worths, London (1966). Greguss, P., Ultrasonic Imaging, Focal Press, London (1980). Halmshaw, R., Industrial Radiology: Theory and Practice, Applied Sci- ence, London (1982). HMSo, The ionising Radiations (Sealed Sources) Regulations (1969). institute of Welding, Handbook on Radiographic Apparatus and Techniques. Krautkramer, J. and H. Krautkramer, Ultrasonic Testing of Materials, 3 rd ed., Springer-Verlag, New York (1983). Marsh, d. M., "Means of visualizing ultrasonics," in Research Techniques in Non-destructive Testing, Vol. 2 (ed., R. S. Sharpe). Academic Press, London (1973). Martin, A. and S. Harbison, An Introduction to Radiation Protection, Chap- man and Hall, London (1972). McGonnigle, W. J., Non-destructive Testing, Gordon and Breach, London (1961). McNab, A. and dunlop, i., "Advanced visualisation and interpretation techniques for the evaluation of ultrasonic data: the NdT workbench," British Journal of NDT (May 1993). Moran, A. J. and K. J. Bower, "Expert systems for NdT--hope or hype?," Non-destructive Testing: Proceedings of the 4th European Conference 1987, Vol. 1 (eds.) J. M. Farley and R. W. Nichols (1987). Mudge, P. J., "Computer-controlled systems for ultrasonic testing," Research Techniques in Non-Destructive Testing, Vol. Vii, R. S. Sharp, ed. (1985). Sharpe, R. S. (ed.), Research Techniques in Non-destructive Testing, Vols. 1­5, Academic Press, London (1970­1982). Sharpe, R. S., Quality Technology Handbook, Butterworths, London (1984). Windsor, C. G., F. Anelme, L. Capineri, and J. P. Mason, "The classification of weld defects from ultrasonic images: a neural network approach," British Journal of NDT (January 1993). Further reAdIng Gardner, W. E. (ed.), Improving the Effectiveness and Reliability of Non- destructive Testing, Pergamon Press, oxford (1992).