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

Display devices: past, present and future

Display devices: past, present and futur

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

Rapid Hemodynamic Deterioration and Death due to Acute Severe Refractory Septic Shock

Despite emergence of early goal directed therapy, septic shock still carries a high mortality. Gram negative septicemia is notorious for rapid deterioration due to endotoxin release. Multi-organ damage due to septic shock carries poor prognosis, and such patients should be managed aggressively with multidisciplinary approach. We present a fatal case of a patient with gram negative septicemia who rapidly deteriorated, and died due to acute refractory severe septic shock. This patient probably developed urosepsis secondary to severe urinary tract infection. He also had infiltrates on chest radiograph. He expired within fifteen hours of presenting to the emergency department. This case emphasizes the importance of early recognition and management of septic shock. Early goal directed therapy has shown to improve mortality. Broad spectrum antibiotics should be started within one hour depending on local immunity of organisms. This case also highlights the fact that despite optimized treatment, this entity has very high mortality rates

Dermatomyositis and supraventricular tachycardia

<p>Abstract</p> <p>Background</p> <p>Dermatomyositis is an idiopathic inflammatory myopathy, often associated with an underlying malignancy. Its prevalence rate is approximately one per 100,000 in the general population, and is even rarer without evidence of a cancer. Dermatomyositis rarely involves myocardial muscle fibers, but has shown to be associated with cardiac arrhythmias.</p> <p>Case Presentation</p> <p>We present a case of a young female patient with known history of dermatomyositis who presented to hospital with a flare up of her disease. She also complained of paroxysms of palpitation. Telemetry monitoring revealed several episodes of paroxysmal supraventricular tachycardia with heart rate reaching up to 220 beats per minute.</p> <p>Conclusion</p> <p>Cardiac involvement in dermatomyositis is a very rare, but well known entity. Dermatomyositis patients with palpitations should be monitored on a Holter monitor, and appropriate therapy initiated if found to have a significant arrhythmia.</p

Synthesis and thermoluminescence properties of gamma ray irradiated NaCl:Dy3+ phosphor

The synthesis and thermoluminescence (TL) properties of &gamma;-irradiated NaCl:Dy3+ phosphors are reported in this paper. The NaCl:Dy3+ phosphors of different concentrations of Dy3+ doped in NaCl host are prepared by a wet chemical method. TL of all phosphors has been recorded for different &gamma;-doses. The nature of variations of peak TL intensities is found to be sublinear with &gamma;-irradiation dose and with the concentrations (0.05-0.5 mol%) of added Dy3+ in all the samples. The dose response curve is linear upto 0.6 kGy. Minimum fading is observed in the prepared sample

Photoluminescence properties of ZnWO4: Dy 3+ phosphor

Zinc tungstate (ZnWO4) exhibits interesting photoluminescent properties and ZnWO4 single crystal was first introduced for microwave devices, fiber optical communications, scintillating materials etc. In this paper reported the photoluminescence property of Dy3+ activated ZnWO4 synthesized by solid state rout at temperature 8500 C. Formation of compound was tested by X-ray diffraction pattern. The photoluminescence characteristic of Dy3+ doped ZnWO4 was studied by excitation and emission spectrum. PL excitation spectrum of ZnWO4:Dy3+ phosphor shows the broad excitation peaks ranging from 220 nm to 320 nm because of [WO6]6&minus; group. The emission spectrum shows the peaks at 488 nm (blue) due to transition 4F9/2 &rarr;6H15/2 with broad background due to self emission of ZnWO4 and 575 nm (yellow) due to transition 4F9/2&rarr; 6H13/2