Search Results

You are looking at 1 - 10 of 19 items for :

  • "zinc sulfide" x
  • Refine by Access: All Content x
Clear All

Abstract  

Copper activated zinc sulphide phosphor was coated with tritiated polystyrene to give self-sustained light sources. The stability of the zinc sulphide phosphor coated with polystyrene was studied. It is suggested that the drastic reduction in light output over a period of two years may be due to the phosphor damage rather than loss of radioactivity.

Restricted access

Abstract  

Activation of zinc sulphide phosphor with beta radiation of 147Pm will provide self-sustaining light sources and are widely used as nocturnal illumination devices. Use of 147Pm as energy source is most promising since it forms non-volatile salts. By virtue of this property, it has been precipitated as hydroxide from its aqueous solution for in situ deposition on zinc sulphide phosphor. In this paper, the details of various reaction parameters such as the rate of deposition of 147Pm(OH)3 on ZnS, duration of shaking, specific activity of phosphor and effect of fatty acid (additive) concentration versus luminosity are illustrated with experimental evidence so as to obtain, under optimum conditions, an overall luminosity of 1000 micro lamberts (lm).

Restricted access

Summary  

Gamma-irradiation has been applied to synthesize nanocrystalline ZnS with average size of 38 nm in a non-aqueous system at room temperature by utilizing homogeneous release of S2- ions from the decomposition of carbon disulfide under γ-irradiation. The structure, morphology, size and optical properties have been studied by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), ultraviolet-visible spectrometer (UV-visible). The product containing zinc ions and the sulfur source has been characterized as β-ZnS, sphalerite phase, with spherical morphology and with a diameter average size of about 38 nm.The possible mechanism of formation of the product is suggested in accord with the experiment.

Restricted access

Abstract  

2–15 g of mercury has been determined by exchange with zinc in65Zn labelled zinc sulphide. The influence of various ions which are likely to interfere in the determination of mercury has also been studied.

Restricted access

Abstract  

5–25 g of copper has been determined by exchange with zinc-65 labelled zinc sulphide. The effect of diverse ions on the determination has also been reported.

Restricted access

Abstract  

Soft beta-particles emitted by tritiated polystyrene are impinged upon a copper activated zinc sulphide phosphor to provide self-sustained light sources for nocturnal illumination of watch dials and timepieces, product advertisements, telephone numbers, exit signs etc. For this purpose phenylacetylene was partially reduced with tritium in di-isopropyl ether medium using 10% Pd/CaCO3 poisoned with quinoline to give styrene. Styrene was polymerized to polystyrene by g-radiation (200 kGy dose). The copper activated zinc sulphide phosphor was then coated with that tritiated polystyrene to give self-sustained light sources.

Restricted access

Abstract  

ZnS(1-x)MSx(x=0.01 and M=Mn2+, Cu2+ and Eu2+) compounds have been obtained by precipitation from homogeneous solutions of zinc, copper, manganese and europium salts, with S2- as the precipitating anion, formed by the decomposition of thioacetamide. The thermal study of the milled zinc acetate, thioacetamide, copper acetate, manganese acetate and europium nitrate, respectively, was studied for thermal analyis TG/DSC. XRD respect exhibits a zinc blend crystal structure.

Restricted access

Abstract  

A comparison between the counting parameters of solid and liquid scintillation methods for radon determination in water is attempted. The counting efficiency is better for a toluene-based liquid scintillator but, as the background is considerably higher than in solid scintillators, the figure of merit and the lower limit of the measurable activity are favorable for a scintillation counter based on zinc sulfide (Ag activated) scintillator.

Restricted access

Abstract  

In this paper the reduction of lead and zinc sulphide by hydrogen is described. It has been found that the rate of formation of elemental lead or zinc is favourably affected by mechanical activation of PbS and ZnS produced by intensive grinding. This effect was observed in the region 678–1048 K for galena and in the region 851–1023 K for sphalerite. It has appeared that disordering in the structure of both minerals results in the decrease in experimental activation energy.

Restricted access