Radiation Protection Dosimetry 85:7-10 (1999)
© 1999 Oxford University Press
Development of New Personal Dosemeter for Low Energy X Rays by Using an Imaging Plate
A new personal dosemeter for low energy X rays is being developed using an imaging plate (IP) fabricated by Fuji Film Co. Ltd which has 103 times higher sensitivity than that of the conventional X ray film badge and makes possible the direct reading of PSL (photostimulated luminescence). To investigate the sensitivity with X ray energy, the plate, which was contacted by various filters was exposed on an acrylic phantom and in free air to X rays of effective energies 12, 18, 31, 50, 60, 69, 80, 101 and 120 keV. The filter set was composed of Al, Zn, Cu, Cd, and Pb, and their thicknesses were 0.1 mm to 1.0 mm. The exposure doses were 0.01 to 0.1 mSv. The sensitivity of the IP without filter in free air showed a large dependence on X ray energy. The data with filters were therefore combined and by taking the weighted sum of these data the flat energy response to the dose equivalent, which is necessary for the personal dosemeter, could be obtained.