Evaluation of the structural characteristics and the fading effects of image plates

Abstract

The photostimulated luminescence (PSL) is the basis for the digital image formation of image plates (IPs). However, the PSL decreases exponentially with the increasing of the elapsed time between the exposure and the IP scanning (t), and consequently, there is a fading of the digital image. The purpose of this paper is to investigate the relationship between IPs physical structure and elemental composition with the fading behavior. Three different types of IPs, with distinct resolutions, were analyzed. The fading behavior with the time, t, has been measured and correlated with their physical structure. Furthermore, micro X‐ray fluorescence (μXRF) analysis was used to provide information on the elemental composition of this layer. The results showed that standard resolution plate have larger grains, thicker sensitive layer, and generate a bigger effect of image fading. The μXRF technique showed that, to compensate the low emission, the high‐resolution IP has a higher concentration of Br and Sr.

Use of parametric X-ray radiation of electrons in crystals to determine the parameters of imaging-plates

“…During the measurement time of 600 s, 2.625 • 10 13 electrons passed through the crystal. Measurements were carried out for the IPU-, IPS-, and IPC2-type imaging plates produced by Baker Hughes [10] and for three reflective planes of a 20 μm-thick Si crystal.…”

“…Here 𝑇 is the thickness of the plate. The main characteristics of the plates: chemical composition, thickness of the plates, protective coating and substrate are given in the work [10]. To compare the measurement results with calculations in order to determine the sensitivity of the IP, a simulation was carried out of the dependence of the efficiency and energy response 𝜂(𝜔), that is, the energy transferred by radiation to secondary electrons in the working volume, for each IP on the photon energy 𝜔, the results of which are shown in figure 1.…”

“…We assumed that secondary electrons are absorbed near the point of interaction of the photon with the atoms of the plate. The work of Silva et al [10] lacks information on plate density. We used a value of 𝜌 = 3.18 g/cm 3 , which corresponds to the MS plate from Fujifilm [8], which has a chemical composition similar to that of the plates used in the present study.…”

A proof-of-principle experiment on a new diagnostic tool for determining beam sizes from angular distributions of parametric X-ray radiation

“…As a detector, we used an imaging plate with dimensions of 250 × 200 mm 2 , a chemical composition of BaSrFBrI:Eu 2+ and a working layer thickness of 112 μm (type IPU, manufactured by Baker Hughes) [23]. As shown in [24], such plates are very convenient for observing the PXR angular distributions because of their large area, high spatial resolution, and the linear dependence of the degree of local ionization in the plate material on the intensity of the detected radiation.…”

“…As shown in [24], such plates are very convenient for observing the PXR angular distributions because of their large area, high spatial resolution, and the linear dependence of the degree of local ionization in the plate material on the intensity of the detected radiation. During X-ray irradiation with the plate, Eu 2+ was ionized to Eu 3+ , and the released electrons were captured by lattice defects [23,25]. After exposure of the plate to the photon beam, the latent X-ray image was read digitally by a photo-stimulated luminescence process using an imaging plate reader (CRxVision, Baker Hughes).…”