Analysis of trapping parameters of KCaSO4Cl:Eu phosphor prepared by acid method

This paper reports the systematic study of KCaSO4Cl:Eu phosphor synthesised by acid distillation method. Single glow peak at 432 is observed in KCaSO4Cl:Eu phosphor. The study of trapping parameters is done with the help of Chen’s peak shape method

Effect of Sm3+ as co-dopant in CaSO4:Dy,P TLD phosphor

CaSO4: Dy,P  and CaSO4:Dy,P,Sm  thermoluminescence (TL) phosphors have been prepared by acid method and their TL glow curves and  photoluminescence (PL)  excitation and emission spectra are recorded. PL emission bands at 565, 599 and 613 nm were observed for CaSO4: Dy,P,Sm under the excitation wavelength 402 nm. Dosimetric peak is observed around 2460C at high temperature.  Co-doping of Sm3+ in CaSO4:Dy,P enhances its TL intensity by a factor of 1.11

Comparative study of Ce3+ activated chlorosulphate phosphors

The synthesis, X-ray diffraction (XRD) and photoluminescence characteristics in chloride based halosulphate phosphors, such as KZnSO4Cl: Ce; KMgSO4Cl: Ce; have been reported in this paper. The Ce3+ emission in KMgSO4Cl: Ce phosphor is more intense than KZnSO4Cl: Ce and it may be useful for scintillation applications

Thermoluminescence (TL) kinetics of CaSO4 and LiF standard materials: a comparative study

In this paper we present comparative reports on CaSO4 and LiF standard materials. CaSO4: Mn has a very high sensitivity but fading of the dosimetry peaks is relatively rapid. The CaSO4: Tm and CaSO4: Dy each has a stable glow peak at about 220°C.  LiF has an effective Z of 8.2 (of. 7.4 for tissue) and the energy response relative to tissue is good. Both the materials are available commercially

Photoluminescence of Ce3+ ions doped in LiAl5O8 aluminate systems

The aluminate phosphors LiAl5O8: Ce was synthesized by combustion synthesis. Photoluminescence (PL) characterization of the phosphors has been reported in this paper. The Photoluminescence (PL) emission spectra of the LiAl5O8: Ce phosphors show strong Ce3+ emission at around 310 nm for the excitation at wavelength of 254 nm wavelength of light due to the 5d→ 4f transition. These phosphors may be useful in scintillation

TL glow curve and kinetic of gamma irradiated quartz collected from Rasmada mines of C.G. basin

Present paper reports the TL glow curve and kinetic parameter of Quartz. The sample of natural quartz collected from Rasmada mines of C.G. basin is irradiated with gamma source. For gamma exposure Co60 gamma source was used and the exposure of 1 hour to 4 hour was given to the sample with dose 0.5kGy to 2 kGy. TL glow for quartz crystal shows the peaks at temperature 242, 256, 250 and 2520C for doses 2kGy to 0.5 kGy respectively. The powder sample shows TL glow peak at 236, 251, 254 and 2530C respectively. The corresponding activation energy and frequency factor is calculated by peak shape method. The activation energy found to be 0.79 eV for powder and 1.26 eV for quartz crystal, frequency factor is found to be 4X108 to 3X1013sec-1. The maximum activation energy is found for quartz crystal with gamma exposure of 2kGy. The sample shows first and second order kinetics. The sample was characterized by XRD. The Induction coupled plasma activated emission spectra (ICP - AES) analysis was done to find out the percentage of elements in the quartz mineral

Transcatheter Mitral Valve Replacement for Degenerated Bioprosthetic Valves and Failed Annuloplasty Rings

Cardiolog