This paper presents a comparative study of the optical and scintillation properties for various inorganic crystal scintillators commonly used in high energy physics experiments. Transmittance, excitation and photo-luminescence spectra were measured for samples with a dimension of 1.5 X0. The transmittance data are compared to the theoretical limit calculated by using refractive index, assuming ...

When vortex electromagnetic waves propagate through a turbulent atmosphere, the amplitude and phase of are disturbed, creating scintillation effect. According to index waves, new method retrieving refraction structure parameter was proposed using genetic algorithm, feasibility this verified by simulated experiments. The numerical results showed that inversed value obtained algorithm close real ...

Background: The new glasses from harmful environmental waste such as cement dust; limestone phosphate, sand and borax (Genkare) were manufactured. Investigation of the radioactivity present in these materials (Phosphate rock, cement dust, limestone, sand and borax) enables one to assess any possible radiological hazard to humankind by such materials. Materials and Methods: Fifteen samples were ...

This contribution proposes a new temporal PET camera concept yielding a precise spatio-temporal localization of a scintillation event within a monolithic scintillator. This concept is promising for PET imaging. The key idea behind this concept is the ability of the system to accurately localize the region of detected un-scattered photons on the Si-PMT detector plane. Then, by ray tracing, an ac...

The vertical distribution of turbulence over Mauna Kea has been measured on four nights in 2002 October, simultaneously using two different instruments based on stellar scintillation—the generalized SCIDAR (scintillation detection and ranging) and MASS (multiaperture scintillation sensor). The turbulence integrals match within 20%, and the low-resolution profiles delivered by MASS correctly rev...

Stars twinkle to the eye through atmospheric turbulence, but planets, because of their larger angular size, do not. Similarly, scintillation due to the local interstellar medium will modulate the radio flux of gamma-ray-burst afterglows and may permit indirect measurements of their angular sizes. The amplitude of refractive scintillation is of order ten percent at ten gigahertz unless the sourc...

In this work, we tested whether plastic scintillation (PS) is a suitable alternative to liquid scintillation (LS) and Cerenkov techniques for beta emitter detection. The main advantage of this alternative is the reduction of mixed waste produced as consequence of the measurement process. In addition, the quality parameters obtained with PS are as reliable as those obtained with LS and allow det...

The very large telescopes and the various optical interferometers provide access to unparalleled angular resolutions scientific data of primary importance, but at price instrumental constraints that require complex equipment. correction atmospheric dispersion (i.e. variation air refractive index versus wavelength) is one these constraints. This comes in three forms: (the image a star spread out...

Collisionless Boltzmann equation is used to describe the intensity correlations in partially saturated and fully regimes terms of photon distribution function phase space. Explicit expression for fourth moment light fields obtained case moderate strong turbulence. Such consists two accounting regions space that independently contribute correlation function. It shown present solution agrees with...

Stars twinkle to the eye through atmospheric turbulence, but planets, because of their larger angular size, do not. Similarly, scintillation due to the local interstellar medium will modulate the radio flux of gamma-ray-burst afterglows and may permit indirect measurements of their angular sizes. The amplitude of refractive scintillation is of order ten percent at ten gigahertz unless the sourc...