R. Zannoni

Development of a terbium-lithium glass for slow neutron detection

Abstract We have developed a new terbium-doped, lithium-loaded scintillating glass for slow neutron detection. This glass has the advantages of an emission spectrum with a maximum at 550 nm and of being drawn easily into optical fibers for the fabrication of scintillating optical fiber plates.

A new cerium scintillating glass for X-ray detection

Abstract We report the synthesis and the characterization of an improved cerium-activated scintillating glass suitable for X-ray imaging. 2 mm thick samples were tested under X-ray excitation and the results are compared with the ones reported for commercial glasses. The glass under investigation is approximately 30% more efficient under the irradiation of a radiological X-ray tube.

Spatial resolution in X-ray imaging with scintillating glass optical fiber plates

Abstract Some scintillating optical fiber plates, fabricated with terbium glasses are tested for their intrinsic spatial resolution under X-ray irradiation and the result is compared with a typical phosphor screen. The spatial resolution (CTF and MTF) is measured as a function of spatial frequency and the standard deviation of the corresponding Gaussian PSF is derived.

Light yield in cerium scintillating glasses under X-ray excitation

Abstract Absolute measurements are reported regarding the photon production per unit energy, under X-ray excitation, of cerium scintillating glasses, as a function of their cerium content (2, 4, 6% by weight of Ce 2 O 3 ) and X-ray energy. The intrinsic energy resolution of this type of glass is also tested.

Slow neutron imaging using scintillating glass optical fibers

Abstract The performance of a slow neutron area detector, based on a scintillating glass fiber plate coupled to an intensified CCD, at room temperature, is reported. In the preliminary test single neutron events are detected with a spatial resolution of ∼ 100 μm (FWHM). Possible improvements are discussed.

Radiation damage and annealing of scintillating glasses

Abstract Measurements of the radiation hardness, of cerium and terbium doped scintillating glasses, are reported in this work. Annealing tests have demonstrated the efficacy of violet-blue light in the repairing of radiation damage.

DQE of imaging detectors in terms of spatial frequency

Abstract The most inclusive parameter describing the performance of an imaging detector may be considered detective quantum efficiency (DQE) expressed in function of the spatial frequencies. In this paper our effort is addressed to formulating a general and absolute expression of the DQE in the frequency domain, coherent with the condition DQE≤QE. The case of a flat-field input image and of integrating detectors is also considered.

DQE MEASUREMENT IN A SCINTILLATING GLASS OPTICAL FIBER DETECTOR FOR X-RAY IMAGING

Abstract An example of the measurement of detective quantum efficiency is illustrated for a scintillating glass optical fiber detector used in X-ray imaging. We have shown the necessity to filter the input Poisson noise of the incoming beam, by the MTF (Modulation Transfer Function) of the detector, in order to obtain the real DQE (Detective Quantum Efficiency).

Slow neutron beam diagnostics with a scintillating fiber detector

Abstract A slow neutron-sensitive scintillating glass optical fiber plate is coupled to an intensified CCD camera, working at standard TV rate and room temperature, for beam positioning and spatial distribution diagnostics. Results are reported about a thermal neutron beam, in the presence of a high gamma-ray background, which is removed by digital image subtraction.

Absolute light yield of plastic scintillators and cerium scintillating glasses under low energy X-ray excitation

Abstract Absolute values and fitting functions are reported for the photon production at room temperature, under low energy X-ray excitation, of NE102A and NE110 plastic scintillators. They are compared with the light yield of GS1 scintillating glass.