Effects of neutral gas atmosphere and temperature on the light yield of new liquid scintillators

Liquid scintillator, based on 1-methylnaphthalene and a new solvent IPN, which emitting in the green spectral range, were studied. The scintillation efficiency in vacuum was 22-32% higher compared to the level in air, and the intrinsic light yield of the scintillators reached 41-50% of the yield from anthracene. The increased level of the scintillation efficiency was virtually retained in the atmosphere of inert gases (Ne, Ar, and CO2). The light yield of liquid scintillators based on 1-methylnaphthalene (in air) and IPN (in vacuum) were virtually independent of the temperature in the interval from -5 to +20 degrees C. Liquid scintillator on the basis of 1-methylnaphthalene and a scintillation additive R6 (concentration 3 g/l) also exhibited a highly stable light yield (+0.024%/K) in the temperature interval from +20 to +60 degrees C

Modern opportunities of radiation diagnostics of small intestine diverticulosis

Diverticulosis of distal parts of a small intestine is a rare and difficultly diagnosed disease. This pathology usually is asymptomatic, and the first clinical manifestations oftenly testify the development of complications. The leading seat in the diagnosis of diverticulosis is borrowed with beam investigative techniques: ultrasonography, barium enterography, CT or MRI.In this article a brief review of clinics and possibilities of instrumental diagnosis of diverticulosis of small intestine is presented and illustrated by clinical case of a patient with large jejunoileal diverticulosis

Luminescent properties of frozen organic scintillators

Temperature dependence of the light yield of 1-methylnaphthalene based scintillators emitting in the green spectral range was studied in the liquid and frozen states. The light yield of the scintillator frozen at -120 degrees C in vacuum increased 2.2-3.3 times compared to the room-temperature value in air, and reached 88-118% of the level for anthracene. All scintillators cooled to -120 degrees C, and then heated to 20 degrees C exhibited a hysteresis in the temperature variation of the light yield. The duration of signals from the frozen samples in air was somewhat longer compared to that at room temperature. The light yield of scintillators studied was sensitive to the ionization density