Study on activity of radium,radon and physicochemical parameters in ground water and their health hazards around Tumkur industrial area

Journal of Radioanalytical and Nuclear Chemistry - The activity of radium (226Ra), radon (222Rn) and physicochemical parameters in ground water around study area were estimated by standard...     

Studies on radon/thoron and their decay products in granite quarries around Bangalore city, India

The radon survey was performed in granite quarries around Bangalore rural district and Bangalore city as part of a lung cancer epidemiological study. Long duration measurements of indoor and outdoor radon, thoron and their progenies concentrations were made around granite quarries of Bangalore rural district by using Solid State Nuclear Track Detector (SSNTD, LR-115, Type-II Plastic track detector) during summer and winter period (2006–07). The increase of radioactivity in granite quarries and inhalation dose to workers and populations near the quarries have been summarized. The higher concentrations of radon and thoron in granite quarries suggest radiation health effects on workers and public around the quarries is higher than permissible levels. The results are presented and analyzed with reference to ICRP limits.     

Furanverbindungen, 14. Mitt.

Zusammenfassung Eine für die Synthese linearer Furoxanthone ohne Substituenten am Furanring geeignete Methode ist dieUllmann-Kondensation von 6-Hydroxycumaran mit verschiedenen o-Chlorbenzoesäuren mit anschließender Cyclisierung und Dehydrierung. Als Beispiele werden die Synthesen von Furo[3,2-b]-, 7-Methylfuro-[3,2-b]-und 8-Methylfuro[3,2-b]xanthon beschrieben.

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A method for the synthesis of linear furoxanthones carrying no substituent in the furan ring is achieved by theUllmann condensation of 6-hydroxycoumaran with various o-chlorobenzoic acids, followed by cyclisation and subsequent dehydrogenation. This is illustrated by the synthesis of furo[3,2-b]-, 7-methylfuro[3,2-b]-and 8-methylfuro[3,2-b]xanthones.

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Diese Veröffentlichung ist ein Teil der Dissertation, dieC. S. Angadiyavar an der Karnatak University zur Erlangung des Titels eines Ph. Dr. einreichen wird.

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10. Mitt.:Y. S. Agasimundin undS. Rajagopal, Chem. Ber.100, 383 (1967).     

Assessment of natural radiation levels in the forest ecosystem of Shankaraghatta-Shivamogga District,India

Journal of Radioanalytical and Nuclear Chemistry - The estimated mean value of activity of radionuclides (226Ra, 232Th, and 40K) in the forest environment of Shankaraghatta are...     

Studies on radon concentration in drinking water around Hemavathi river basin,Karnataka State,India

Concentrations of radon in drinking water collected from 32 locations of Hemavathi river basin, Karnataka, India have been measured by emanometry method. The radon concentration in water ranged from 2.7 ± 0.1 to 138.5 ± 1.5 Bq l⁻¹ with a geometrical mean of 25.3 ± 1.1 Bq l⁻¹. The study revealed that about 82.35% of drinking water samples contained radon concentration more than 11.1 Bq l⁻¹, the limit is fixed by Environmental Protection Agency. Among the different parameters measured, concentration of radon showed weak correlation with chloride and no correlation with alkalinity, pH, nitrate, sulphate, fluoride and total dissolved substance.

     

Structural,thermal, and electrical studies of sodium iodide (NaI)-doped hydroxypropyl methylcellulose (HPMC) polymer electrolyte films

Solid polymer electrolyte films based on hydroxypropyl methylcellulose (HPMC) complexed with sodium iodide (NaI) were prepared using solution cast method. The dissolution of the salt into the polymer host and the structural properties of pure and complexed HPMC polymer electrolyte films were confirmed by X-ray diffraction (XRD) studies. XRD results revealed that the amorphous domains of HPMC polymer matrix were increased with increase in NaI salt concentration. The degree of crystallinity was found to be high in pure HPMC samples. The thermal properties were studied using differential scanning calorimetry (DSC). DSC results revealed that the presence of NaI in the polymer matrix increases the melting temperature; however, it is observed that fusion heat is high for pure HPMC films. The variation of film morphology was examined by scanning electron microscopy. Fourier transform infrared spectral studies revealed vibrational changes that occurred due to the effect of dopant salt in the polymer. Direct current conductivity was measured in the temperature range of 313–383 K. The magnitude of electrical conductivity was found to increase with the increase in salt and temperature concentration. The data on the activation energy regions (regions I and II) indicated the dominance of ion-type charge transport in these polymer electrolyte films. The composition HPMC:NaI (5:4) is found to exhibit the least crystallinity and the highest conductivity.