Development of standard sources for imaging plate system

Imaging plate system is now in wide use in diagnostic radiography, and also it is very effective for low level radioactivity measurement. Image data are read out by laser scanning of sensor plate and data are stored directly in a computer system, so that they are very suitable for inspection of low level radioactivity, especially for contamination monitoring of floor or such flat surface material. To get exact activity level, standard sources for imagining systems are desirable to be thin and flat, small as possible and applicable for resolution check, a set of different activities like a color index of contour map and well calibrated both activities and emission rate of charged particles. We tried to use ink-jet printer mixing a small amount of radioactive solution in the ink. Several test patterns were printed and measured by the imagining plate system. This method was successfully works and some of printed results were presented in this paper. (T. Tanaka)