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[en] In the present work, we report the luminescence data obtained from heavy, barytes loaded, concrete containing many crystalline inclusions, extracted from a shielding block located at CERN. The use of both Thermoluminescence (TL) and Optically Stimulated Luminescence (OSL) signals, resulting from a specific trap at about 200 oC, is investigated for retrospective dosimetry purposes. By applying thermal cleaning experiments the TL signal of interest was isolated. Basic TL and OSL properties as thermal and optical stability, repeatability and mainly the linearity of the TL and OSL signals as a function of beta dose were investigated. The implications of all these luminescence properties to retrospective dosimetry are also briefly discussed.
[en] Most radio-opaque markers used in surgical gauze contain barium sulphate, and a minimum percentage content of this is required to ensure an acceptable level of radio-opacity. When this minimum percentage is specified by Standards authorities, a suitable test method must be available to determine compliance. A new radiographic test method is presented which can be used to determine the barium sulphate content or equivalence to within 2% of compliance requirements. The method consists of immersing the marker in a solution of barium sulphate which is then radiographed. Compliance can be evaluated by inspection of the radiograph. The method was found to be virtually independent of x-ray energy, film-screen combination and thickness or shape of the test object. The method is also an appropriate test for any other material or object, such as vascular catheters used in radiology or small toys which pose an ingestion hazards. (author)
[en] A barium sensor is applied to the indirect determination of sulfate by flow injection. An improved method for the preparation of the barium/gepal CO-880/TPB complex for use in the sensor is described. The sensor is fast in response and the potential is table and reproducible. A novel mixer to produce concentrations gradients in flow injection titrations is discussed. This provide efficient radiant mixing of the sample and carrier while keeping the overall dispersion of the system low. (auth.). 23 refs.; 8 figs.; 1 tab
[en] This study examines the movement of food item and the estimation of gastric emptying time using the X-radiography techniques, in the clownfish (Amphiprion ocellaris) fed in captivity. Fishes were voluntarily fed to satiation after being deprived of food for 72 hours, using pellets that were tampered with barium sulphate (BaSO4). The movement of food item was monitored over different time of feeding. As a result, a total of 36 hours were needed for the food items to be evacuated completely from the stomach. Results on the modeling of meal satiation were also discussed. The size of satiation meal to body weight relationship was allometric, with the power value equal to 1.28
[en] The conventional barium chloride (BaClsub(2)) precipitation has been effective in the 99+ percent removal of radium-226 as radium-barium sulphate [RaBa(SOsub(4))sub(2)] sludge, from HCl liquors produced by laboratory and pilot leaches of Canadian uranium ores. Radium-226, due to its low-level radiation characteristics, is removed as it has been identified as an environmental and long-term health problem. The formation of the RaBa(SOsub(4))sub(2) sludge was aided due to adequate sulphate (SOsub(4)) concentrations in the HCl pilot liquors produced. Recyclable Rasup(226) concentrations of about 66 pCi/L, in treated effluents, will cost about 1/10 that of effluents below federal environmental guidelines of 10 pCi Rasup(226)/L. Toxic barium (Ba) will potentially build up in effluents as recyclable Rasup(226) concentrations around 66 pCi/L. Barium, in addition to being added to liquors as BaClsub(2) precipitant, is present in the radioactive ore and HCl leach liquors
BackgroundAlthough the anatomical features of the hepatic capsular arteries have been previously reported, the radiological and clinical importance of these arteries has not been well documented.
Imaging findingsWe injected barium sulfate into the intra- and extra-hepatic arteries in cadavers to investigate the hepatic capsular arteries. The web-like hepatic capsular arteries derived from the capsular branch of the peripheral hepatic arteries are called isolated arteries. There were anastomoses between the intra- and extra-hepatic arteries (inferior phrenic artery, superior falciform ligament artery, and cystic artery) through the hepatic capsular arteries.
Clinical significanceWe reviewed the radiology database and assessed clinical cases. When the hepatic artery is occluded, the collateral vessels, such as the inferior phrenic artery and the superior falciform ligament artery, develop via the hepatic capsular arteries at the right triangular ligament and falciform ligament, respectively. Bleeding from capsular arteries causes extensions of the subcapsular hematoma.
ConclusionThe hepatic capsular arteries spread along the hepatic surface and constitute the vascular network throughout the liver. These arteries play an important role in collateral circulation in various clinical situations, as well as subcapsular hematoma.
[en] Two solutions of barium sulphate, 60 and 30% w/v, were compared with the ''overflow'' Bronchographic method. Two groups of eight healthy adult does of both sexes, weighing 7 to 18 kg were used for the study. The dogs were anaesthetised with thiopentone sodium 2% (20 mg/kg iv). After intubation, each dog received contrast medium by a catheter connected to a syringe, in a 9 mi dose. Two series of two x-rays plates were taken in left lateral recumbent, 3 and 6 min after administering the contrast medium and in ventrodorsal projection, 30 sec. later. The x-ray plates obtained were analysed and compared intra and inter group considering the advance speed of the contrast medium, the radiographic density and outlines. Adverse reactions were controlled
[en] In experiments with 27 dogs aged 2 to 5 years, in three groups, morphine 1 mg/kg body weight. Eunarcon 50 mg/kg and Tranquiline 5 mg/kg slowed down the peristalsis of the digestive tract, as shown by radiological monitoring of barium sulfate passage. In dogs treated with morphine 12 hours on average were required for the contrast substance to arrive in the rectum, for Eunarcon 9 hours and for Tranquiline 6 hours