Olariu, Gheorghina (szerk.): Sesiunea Internaţională de Restaurare - Conservare (Satu Mare, 1997)
Investigaţii, conservare
systems, with faster data processing hardware, new materials for radiation detection and not the least the last computer hardware and software development. The industrial computerized tomography was a field of concern in our institute since 1989, starting with high resolution non-destructive control investigation using computerized control means. In 1990 we achieved the first experimental model of tomograph for small size objects, provided with 200 mCH37 Cs y ray source, two freedom degrees shift system and Nal( T1 ) detector. Its performance was encouraging, but it also showed some drawbacks among witch the most important. The first industrial prototype of a computerized tomograph named TOMORAY -1 was achieved in 1993 and its constructors succeeded in eliminating most of the drawbacks occurring in the laboratory model. One more freedom degree( vertical translation ) was added, and also the earliest 3D- tomographs in our country were carried out. Using this equipment we carried out hundreds of tomograms, in our attempts to improve reconstruction algorithms for 2D and 3D nondestructive testing analysing. The main drawback of this equipment is the slow rate of data acquisition because of monodetector geometry. Now, in our laboratory, a third tomograph model designed in FAN - BEAM multidetector geometry to allow important decrease in data acquisition time and significant increase in performance, is it an advanced phase of development. During the first experimental stage we thought to develop some software facilities, for promoting the industrial applications. In 1994 we started to use our equipments in archaelogical objects analysis where we have some interesting results. In this field of research is much important to analyse an object without damaging any part of it, so the computerized tomography is one of the best methods to obtain complete information about the tested object. There are many reasons for applying CT in archaeological and old objects testing. One is to discover the technology used to build those samples. With this method we can find out if an object was moulded o’ sculpted. Also is important to see the constituents materials of ' sample, to characterise the building period. So we can determine bronze was alloyed with other material, we can find out if there a’ 27
