We investigated the scintillation properties of nonuniformly correlated (NUC) beams in atmospheric turbulence and have shown that NUC beams can not only have lower scintillation but also higher intensity than Gaussian-Schell model beams and even higher intensity than coherent Gaussian beams over certain propagation distances.

Results of tests on NaI scintillation crystals operated at cryogenic temperatures are described. Crystals grown using both the Bridgeman-Stockbarger and Czochralski techniques were tested. Light output and scintillation pulse shape properties are assessed as functions of temperature using gamma and 252 Cf neutron sources and the results are interpreted with a view to optimising detector perform...

Characteristics of a scintillation proportional counter with WLS fiber optics readout is described. The possibility of detection of the proportional scintillation signal produced by the single electron of primary ionization is shown. The counter can be applied for the experiments in ”low–background” physics which require a low energy threshold. E-mail : akimov [email protected]

The development of detectors for both counting and measuring the energy of particles and photons has played an important role in the evolution of nuclear physics. In this experiment, you will be introduced to one such detector the scintillation counter which is particularly suitable for detecting γ-ray photons. You will use it to observe the energy spectrum of γ-rays from several nuclei and stu...

Wireless communication in the millimetre frequency bands is subject to severe atmospheric impairment caused by rain and scintillation, which may occasionally cause deep fades and thus needs to be mitigated by an efficient countermeasure such as adaptive coding and modulation (ACM). In this paper we focus on stratospheric communication and propose appropriate rain and scintillation fading channe...

The aim of the study was to measure the carbon 14 activity at natural level in air samples using classical methods of radiochemistry and beta counting. Three different methods have been tested in order to minimise the detection limit. In the three methods, the first step consists in trapping the atmospheric carbon 14 into NaOH (1N) using a bubbling chamber. The atmospheric carbon dioxide reacts...

We present a method for the measurement of hydrogenase (H(2)ase) activity in aquatic sediments. The assay is based on the H(2)ase-mediated isotopic exchange between dissolved molecular hydrogen (H(2)) and water. A slurry of sediment material is incubated with a tritiated hydrogen (HT) headspace in a glass syringe on a rotary shaker. The method includes a procedure for preparing HT from radiolab...

Uptake of (14)CO(2) in soils due to algae or sulfur-oxidizing bacteria was examined by incubation of soil samples with gaseous (14)CO(2) and subsequent chemical oxidation of biologically fixed radioactive isotope to (14)CO(2) for detection with a liquid scintillation counting system. The (14)CO(2) was added to the soil in the gas phase so that no alteration of the moisture or ionic strength of ...

We examined uptake of the model therapeutic agent, minoxidil, into appendages, stratum corneum (SC), and through human skin, under the influence of different vehicles. Quantitative estimation of therapeutic drug deposition into all three areas has not previously been reported. Finite doses of minoxidil (2%, w/v) in formulations containing varying amounts of ethanol, propylene glycol (PG), and w...