Abstract
A systematic study of the attenuation (absorption) of electromagnetic radiation in Nuclear Track Detectors (NTDs) is carried out. The attenuation of gamma rays, X-rays, UV and visible ...radiations in NTDs are investigated using NaI(Tl) detector, Gas Electron Multiplier (GEM) detector and UV-Vis spectrophotometer respectively.
The values of some important parameters (e.g., mass attenuation coefficient, optical depth) of three commercially available NTDs (PET, Makrofol® and CR-39®), at the relevant regions of the electromagnetic spectrum, are determined. The details of the experimental techniques and the results are also presented in this report.
A quad-GEM prototype is built and tested with Ar+CO2 gas in 70:30 ratio with positive pressure at a flow rate of 100 ml/min. The detector is tested with Fe55 X-ray source and a X-ray generator. The ...measurements are performed with a high gain preamplifier. The gain and energy resolution are measured. The anode current is also measured for different configurations. The detail measurements and results are presented.
A muon detection system (MUCH) based on a novel concept using a segmented and instrumented absorber has been designed for high-energy heavy-ion collision experiments. The system consists of 6 hadron ...absorber blocks and 6 tracking detector triplets. Behind each absorber block a detector triplet is located which measures the tracks of charged particles traversing the absorber. The performance of such a system has been simulated for the CBM experiment at FAIR (Germany) that is scheduled to start taking data in heavy ion collisions in the beam energy range of 6–45AGeV from 2019. The muon detection system is mounted downstream to a Silicon Tracking System (STS) that is located in a large aperture dipole magnet which provides momentum information of the charged particle tracks. The reconstructed tracks from the STS are to be matched to the hits measured by the muon detector triplets behind the absorber segments. This method allows the identification of muon tracks over a broad range of momenta including tracks of soft muons which do not pass through all the absorber layers. Pairs of oppositely charged muons identified by MUCH could therefore be combined to measure the invariant masses in a wide range starting from low mass vector mesons (LMVM) up to charmonia. The properties of the absorber (material, thickness, position) and of the tracking chambers (granularity, geometry) have been varied in simulations of heavy-ion collision events generated with the UrQMD generator and propagated through the setup using the GEANT3, the particle transport code. The tracks are reconstructed by a Cellular Automaton algorithm followed by a Kalman Filter. The simulations demonstrate that low mass vector mesons and charmonia can be clearly identified in central Au+Au collisions at beam energies provided by the international Facility for Antiproton and Ion Research (FAIR).
Stability study of gain and energy resolution for GEM detector Roy, S.; Rudra, S.; Shaw, S. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
08/2019, Letnik:
936
Journal Article
Recenzirano
Odprti dostop
Study of the stability of gain and energy resolution for a triple GEM detector has been performed under continuous radiation of X-ray with high rate, using premixed gas of Argon and CO2 in 70/30 ...ratio and conventional NIM electronics. A strong 55Fe X-ray source is used for this study. The novelty of this study is that for the stability test same source is used to irradiate the GEM chamber and to monitor the spectrum. The radiation is not collimated to a point but exposed to a larger area. Effect of temperature and pressure on these parameters are also studied. The detail method of measurement and the first test results are presented.
Study of performances of a straw tube detector with high rate Roy, S.; Nandi, N.; Adak, R.P. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
08/2019, Letnik:
936
Journal Article
Recenzirano
We report the results from characteristic study of a straw tube detector prototype using premixed gas of Argon and CO2 in 70/30 and 90/10 volume ratio. In this study the gain and the energy ...resolution are measured using Fe55 X-ray source. Same X-ray source is used to irradiate the straw and to collect the spectra. The main motivation of this work is to study the variation of the gain and energy resolution of the straw tube detector with X-ray rate per unit length in a laboratory for the first time. No accelerator or X-ray generator is used. The details of the test set-up, the method of measurement and the test results are presented in this paper.
The main aim of the study is to perform the long-term stability test of gain of the single mask triple GEM detector. A simple method is used for this long-term stability test using a radioactive ...X-ray source with high activity. The test is continued till accumulation of charge per unit area > 12.0 mC/mm2. The details of the chamber fabrication, the test set-up, the method of measurement and the test results are presented in this paper.
Background: A reduction in turnaround time at any laboratory is critical for early assessment. Our aim of the study was to evaluate the effects of various spin paces and timespans on certain serum ...electrolyte concentrations, such as sodium (Na+), potassium (K+), and chloride (Cl-). Methods: A cross-sectional, observational study was carried out on 66 apparently healthy volunteers. 10 ml of blood was drawn from each and divided into 4 labelled clot vials (2.5 ml in each vial). Concentrations of serum Na+, K+, and Cl- were assessed in 2 groups (1, 2), each with 33 individuals. Group 1 had varying spin pace parameters (1500 rpm, 2500 rpm, 3500 rpm, and 4500 rpm), and group 2 included various timespans (2 min, 5 min, 10 min, and 15 min). The observations were analyzed using statistical package for the social sciences (SPSS). Analysis of variance (ANOVA) was implied along with a post-hoc Tukey test. A p value of <0.05 was considered statistically significant. Results: Mean concentrations of Na+, K+, and Cl- at different spin paces for a fixed runtime of 2mins had statistically no differences between each other: Na+ (p=0.978), K+ (p 0.999), and Cl- (p=0.997). However, there were statistically significant mean differences at various timespans for Na+ (p<0.001), K+ (p<0.001), and Cl- (p<0.001). Conclusions: Our study concludes that Na+, K+, and Cl- concentrations were not altered at various spin paces. A timespan of 2 mins at 4500 rpm outperformed the benchmarks without affecting the results, signifying that it can be routinely chosen for estimating serum electrolytes such as Na+, K+, and Cl-, effectively lowering turnaround time.
A systematic study of the attenuation of electromagnetic radiation in Nuclear Track Detectors (NTDs) is carried out. The attenuation of gamma-ray, X-ray, UV, visible, and infrared radiation in NTDs ...are investigated using NaI(Tl) detector, Gas Electron Multiplier (GEM) detector, UV-Vis spectrophotometer, and FTIR spectrophotometer respectively. The values of some important parameters (e.g., optical depth, attenuation coefficient, etc.) of three commercially available NTDs (PET, Makrofol r and CR-39 r ), at the relevant region of the electromagnetic spectrum, is determined. The details of the experimental techniques and the results are also presented in this paper.
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