When the latent images formed by exposure with incident particles in the phosphor of Imaging Plate (IP) are irradiated with laser beam, photo-stimulated luminescence (PSL) is emitted and read through a photomultiplier. PSL intensity fades with increasing the elapsed time between the exposure and the PSL reading. When the IP is read successively, the PSL intensities decrease with the number of reading times. The tendency of the decreasing becomes gradual with increasing the elapsed time after exposure. The multiple successive reading method gives the means of the correction of the fading.

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Characteristics and Correction of the Fading of Imaging Plate

Background radiation and radioactive sources have been measured with laser-scanned phosphor imaging plates using an image processing method that produces spectra. This enables distinction between ambient background radiation, alpha and beta radionuclides and provides a means for quantitation. The background counts span a broad spectral continuum, whereas counts resulting from alpha and beta activity are restricted to certain regions within the background continuum spectrum. The alpha-counting spectral region has a background count rate of −2  h −1 . The beta-counting region has a count rate of −2  h −1 . One region of the background spectrum is attributed to heavy ions from cosmic rays and has a count rate of −2  day −1 . With regard to imaging spectrometry, beta-particles from 3 H ( E max =0.0186 MeV) could be distinguished from higher energy beta-particles such as those from 14 C ( E max =0.157 MeV) and 40 K ( E max =1.33 MeV). Beta-particles can be distinguished from alpha-particles, and radionuclide counts can be distinguished from the background. The spectral characterization of the background, alpha-particles and beta-particles is expected to support applications in cosmic ray, heavy ion, radionuclide and electron studies.

Spectral measurements of imaging plate backgrounds, alpha-particles and beta-particles

A new in vivo thyroid monitoring system was devised with radioluminography using an imaging plate. The counting features of the system were investigated by using a neck-thyroid phantom. A clear thyroid image was obtained at thin prethyroid tissue thicknesses and short distances between IP and neck surface. The characteristic 125 I thyroid image made it possible to visually confirm that the thyroid definitely accumulated 125 I. The counting efficiency in 100×cps Bq -1 of the imaging plate system was determined by setting a region of interest on the thyroid image resulting in a maximum efficiency of 0.5%. The higher efficiency was obtained for thinner tissue thickness overlaying the thyroid, smaller thyroids, and shorter distances between the imaging plate and neck surface. The imaging plate thyroid monitoring system was sensitive to thyroid 125 I. Its minimum detection limit of 23 Bq for a 10-min measurement was considerably lower than the annual thyroid burden limit of 300 kBq.

In-vivo thyroid 125I monitoring method using imaging plate.

Distribution images of natural radioactivity in natural materials such as vegetables were obtained by using Imaging Plate. In such cases, it is necessary to reduce background radiation intensity by one order or more. Graded shielding is very important. Especially, the innermost surface of a shielding box should be covered with acrylic resin plate. We obtained natural radioactivity distribution images of vegetables, sea food, meat etc. Mostly β-rays emitted from40K print the radioactivity distribution image. Comparison between γ-ray intensity of KCl solution measured with HPGe detector and that of natural material specimen gave the radioactivity around 0.06∼0.4 Bq/g depending on the kind and the part of specimens.

Radioactivity distribution measurement of various natural material surfaces with Imaging Plate

An automated counting and data processing system for determining the radioactivity of 32 P was devised by using an image analyzer, an imaging plate, and a personal computer. This system can measure 18 samples containing 32 P concurrently and print out the results as a report.

Automatic activity measurement and data processing system using image analyzer

An imaging plate has a very high sensitivity, and it is useful for in situ measurements of the distribution of extremely low levels of radioactivity, down to about 10 −3 Bq/mm 2 , of material surfaces such as stones, vegetables etc. A method to determine the radioactivity is proposed in such applications.

Measurement of the radioactivity distribution of material surfaces with an imaging plate

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Measurement of the radioactivity distribution of material surfaces with an imaging plate