A parallel plate type of mobility spectrometer provided with nuclear plates which are placed in a row in the middle area of collecting plates prior to sampling is examined for measuring the mobility spectra of radioactive charged aerosols. By this technique, it is able to record a ray tracks of radioactive substances collected on the surface of nuclear plates during and after

The expected performance of track reconstruction with LHC events using the CMS silicon tracker is presented. Track finding and fitting is accomplished with Kalman Filter techniques that achieve efficiencies above 99% on single muons with pT >1 GeV/c. Difficulties arise in the context of standard LHC events with a high density of charged particles, where the rate of fake combinatorial tracks is ...

Difficulties observed in the application of track theory to CNO particles are attributed to problems in the application of a light scattering correction in microphotometry. 257 Figure 1. Track width W/4 μm vs residual range, of cosmic ray ions in G.5 emulsion. Light scattering parameters are fitted to the track of a 24Mg ion. When the width is calculated for lighter ions (curves) they depart in...

The solid-state nuclear track detector CR-39 is widely used as a detecting mechanism in physics experiments as well as for industrial purposes such as neutron dosimetry and radon detection. The upper limit of detectable charged-particle fluence on CR-39 is set by physical overlapping or ‘pulse pileup’ of particle tracks on the surface. In the low-overlap regime the overlapping fraction of track...

In determining the etched track rate in solid-state nuclear track detectors, track lengths should be determined accurately. A method based on surface profilometry is proposed to determine the track lengths in CR-39 detectors through measurements of their replicas. Tracks from alpha particles with an incident energy of 4 MeV have been chosen to demonstrate the method. After irradiation and chemi...

Although the optical microscope has been the main tool for observations of etched tracks in solid state nuclear track detectors for many years, there has been relatively little investigation about the optical characteristics of these tracks. This chapter describes the application of the ray tracing method to light propagation through these etched tracks. The method is shown to be able to reprod...

Biochemical fractionation procedures previously shown to remove 95% of cellular protein, DNA, and phospholipid, were combined with fluorescence in situ hybridization to provide a critical evaluation of the retention and spatial preservation of specific primary transcripts within the chromatin-depleted nuclear substructure, operationally defined as the nuclear "matrix." This unique approach made...

Measurement of the direction of the elastic nuclear recoil track and ionization charge distribution along it, gives unique possibility for unambiguous detection of the dark matter WIMP particle. Within current radiation detection technologies only Time Projection Chambers filled with low pressure gas are capable of such measurement. Due to the character of the electronic and nuclear stopping po...