[en] The average time resolution (σ) of about 70 ps is obtained for each of four scintillation counters at a long duration test on the CERN SPS particle beam. The counters were assembled of 2.4 x 2.4 x 6.0 cm³ scintillator bars and FEU-87 (CsSb) type photomultipliers, both made in Russia. We observed the non-stability of mean time-of-flight (TOF) value during the runs. The maximum TOF drift contribution into the time resolution is estimated as (10-15 %)

[en] Short communication

[en] Short communication. 1 fig

[en] .The unit consists of a container with a linear radiation source situated under the upper part of the belt conveyor; a scintillation detector installed over the flow of bulk material; a tacho-meter for the speed of the belt conveyor; an electronic data processing unit. The data processing unit consists of parallelly connected pulse emplifier, descriminator, linear meter, level normalizer, linearizor, analogue multiplierintegrator, digital counter, voltage regulator. The scintillation detector consists of consequently optically connected crystal spectrophotometric scintillator, a plastic scintillator a few times longer than the spectrophotometric scintillator, and a spectrophotometric multiplier directed perpendicularly to the emission exis. The stubilizer unit is connected to the gamma emitting linear radioizotope source through the scintillation detector

[en] In order to exploit the high event rates at ISABELLE, it will be necessary to have fast detection with fine spatial resolution. The authors are currently constructing a prototype fine-grained hodoscope, the elements of which are scintillating optical fibers. The fibers have been drawn from commercially available plastic scintillator which has been clad with a thin layer of silicone. So far it has been demonstrated with one mm diameter fibers, that with a photodetector at each end, the fibers are more than 99% efficient for lengths of about 60 cm. The readout will be accomplished either with small diameter photomultiplier tubes or avalanche photodiodes used either in the linear or Geiger mode. The program of fiber development and evaluation will be described. The status of the APD as a readout element will be discussed. Finally, an optical encoding readout scheme will be described for events of low multiplicity

[en] Plastic scintillators offer several advantages for nuclear safeguards research and technology to those who design, assemble, encapsulate, and calibrate detectors from raw materials that are commercially available. These large, inexpensive detectors have good spatial uniformity and good high-energy gamma-ray response. Uniform light collection is obtained with a light pipe attached to a polished scintillator wrapped with aluminum foil. Best low-energy response is obtained by applying a variance analyzer to select the low-energy bias level

[en] In this work, the variation in the signals collected in two photomultiplier tubes placed in the edges of a plastic scintillator detector is studied. The spectrum from each of the photomultipliers is digitized, and also how they change when the source position changes. The plastic scintillator detector used, measuring 2 x 2 x 20 cm³, was developed by IPEN Nuclear Industrial Application Department, made with styrene polymer added with 0.5% PPO - '1.4 diphenyl-oxazole' and 0.05% POPOP - '1-4 di-2-(5-phenyl-oxazolyl)-benzene'. The main reason for using a plastic scintillator detector comes from the ease for making this kind of detector and its low price. The result show that the system is, indeed, position sensitive, and that further efforts should be made to enhance its sensitivity and resolution. (author). 1 ref., 11 figs

[en] Accurate measurement of the electron dose distribution near an inhomogeneity is difficult with traditional dosimeters which themselves perturb the electron field. The authors tested the performance of a new high resolution, water-equivalent plastic scintillation detector which has ideal properties for this application. A plastic scintillation detector with a 1 mm diameter, 3 mm long cylindrical sensitive volume was used to measure the dose distributions behind standard benchmark inhomogeneities in water phantoms. The plastic scintillator material is more water equivalent than polystyrene in terms of its mass collision stopping power and mass scattering power. Measurements were performed for beams of electrons having initial energies of 6 and 18 MeV at depths from 0.2-4.2 cm behind the inhomogeneities. The detector reveals hot and cold spots behind heterogeneities at resolutions equivalent to typical film digitizer spot sizes. Plots of the dose distributions behind air, aluminum, lead, and formulations for cortical and inner bone-equivalent materials are presented. The plastic scintillation detector is suited for measuring the electron dose distribution near an inhomogeneity. 14 refs., 9 figs

[en] Plastic scintillator detectors were developed by polymerisation in the PPO and POPOP solution in styrene monomer, using catalyst 1-1 Bis(terc-peroxybuthyl)cyclohexane ranging from 0.008 to 0.5%. In order to study the catalyst influence on the plastic scintillator quality, the luminescence emission, transmittance, decay constant and light output for alpha and gamma rays were evaluated. For comparison, the same evaluation measurements were carried out using the plastic scintillator detector produced by thermal polymerisation under vacuum (1.0 x 10^-2 mbar), without catalyst. The results indicated that the catalyst concentration must range from 0.008 to 0.1%. (author). 10 refs., 7 figs., 1 tab

[en] The Analogue Hadron Calorimeter (AHCAL) is one of the several calorimeter designs developed by the CALICE collaboration for future linear colliders. It is a high granularity sampling calorimeter with plastic scintillator tiles of 3 x 3 cm"2, adding up to ∝8'000'000 sensors. This large amount of channels requires a powerful data acquisition system (DAQ). In this DAQ system, the Link and Data Aggregator module (LDA) acts as an intermediate component to group together several layers units, dispatching control signals and merging data. A first LDA design (mini-LDA), intended to be flexible but limited to a small number of layers, has been successfully used during the end-of-the-year 2014 CERN Test Beam program. A second prototype (wing-LDA), compatible with a complete detector design, is operating during the Test Beam program of 2015. This talk will present the current status of the DAQ and the LDA, with recent results from Test Beam and future plans.