Results 261 to 270 of about 261,370 (287)

Automated track measurements in CR-39

Nuclear Tracks, 1980
Abstract It has recently become possible to automate certain aspects of data analysis in cosmic-ray experiments employing plastic track detectors. This is due to the discovery of a new track detector, CR-39, and the development of fast microprocessor-based image analysers.
openaire   +1 more source

Characteristics of antiproton tracks in CR-39

Radiation Measurements, 2007
Abstract CR-39 detectors were exposed to 5.9 MeV antiprotons at CERN. After exposure, the detectors were etched in 6N NaOH solution at 70 ∘ C . Antiproton tracks were revealed after 135 min of etching and their further growth was studied as a function of etching time. Antiproton track diameter and track density were measured after each
M.A. Rana, E.U. Khan, M.I. Shahzad, S. Manzoor, G. Sher, I.E. Qureshi   +5 more
openaire   +1 more source

Polymerization kinetics of CR-39 by FTIR

International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements, 1986
Abstract A study of the polymerization reactions in CR-39 can lead to a deeper understanding of the performance of the plastic as a track recorder. Fourier transform infrared spectroscopy has been used to follow the polymerization reaction to completion.
T Portwood, J Stejny
openaire   +1 more source

Kinetics and control of polymerising CR-39

Nuclear Tracks and Radiation Measurements (1982), 1984
Abstract Temperature gradients caused by the heat of polymerization during cure of diethylene glycol bis(allyl carbonate), CR-39 have resulted in depth dependency and variations of the track recording properties. Curve fitting of the experimental data to the polymerizing equation and heat transfer analysis, has led to an anomaly which is explained by
T. Portwood, T.W. Turner, A.P. Fews
openaire   +1 more source

Low energy proton measurements using CR-39

Nuclear Tracks and Radiation Measurements (1982), 1984
Abstract Track structures in SSNTD materials have optical properties which may prove useful in measuring proton spectra. Preliminary data on the elastic light scattering by proton or neutron tracks indicate that the fluence of stopping proton tracks can be quickly determined by light scattering measurements.
P.J. McNulty, W.D. Shirkey, S.R. Palmer, Orapin Wipasuramonton, R.C. Filz   +4 more
openaire   +1 more source

Calibration of CR-39 with monoenergetic protons

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2009
Abstract Calibration of solid state nuclear track detector CR-39 was carried out with very low-energy monoenergetic protons of 20–100 keV from a Cockcroft Walton accelerator. To reduce the beam of the proton from the accelerator, a novel method was adopted by means of a high voltage pulse generator.
Duan Xiaojiao, Lan Xiaofei, Tan Zhixin, Huang Yongsheng, Guo Shilun, Yang Dawei, Wang Naiyan   +6 more
openaire   +1 more source

Track replica method applied to CR-39

Radiation Measurements, 1997
The replica method has been applied before to detector materials which can be easily removed from the replica by specific solvents. Taking into account that CR-39, one of the most sensitive ion track detectors, can not be removed by any solvent without altering the replica materials, the technique had to be adapted for using with this material ...
L. Borgonovo, G. Saint-Martin, O.A. Bernaola, I. Nemirovsky, W. Kirschbaum   +4 more
openaire   +1 more source

A curing cycle for detector-quality CR-39

Nuclear Tracks, 1981
ABSTRACT Commercially available CR-39 has been found to etch non-uniformly as a function of depth through the thickness of a sheet. This apparently occurs because the sheet overheats internally during polymerization. Results are presented on a curing cycle designed to maintain a low rate of polymerization throughout the curing process.
openaire   +1 more source

CR-39 imaged by atomic force microscope

Nuclear Tracks and Radiation Measurements, 1993
Abstract The application of AFM (NanoScope II) for the surface imaging of allyldiglicol carbonate (CR-39) polymer shows great roughness from profile diagrams and direct visulisation of the surface which include polymer separate flakes. There is the idea for imaging free radicals ends by AFM or another type of SPM.
J.B. Vuković, R. Antanasijević
openaire   +1 more source

The LLNL CR-39 Personnel Neutron Dosemeter

Radiation Protection Dosimetry, 1988
We developed a personnel neutron dosimetry system based on the electrochemical etching of CR-39 plastic at elevated temperatures. The doses obtained using this dosimeter system are more accurate than those obtained using other dosimetry systems, especially when varied neutron spectra are encountered. This CR-39 dosimetry system does not have the severe
Hankins, D.E., Homann, S., Westermark, J.   +2 more
openaire   +1 more source