Rajshahi University Journal of Science

Particle Induced X-ray Emission (PIXE): A Tool of Qualitative Elemental Analysis for Biological Sample

2013-10-09T07:43:18+00:00

The facility of ion beam laboratory at Kochi University of Technology (KUT) has been extended by installing the Particle Induced X-ray Emission (PIXE) technique, in order to provide qualitative and quantitative elemental analysis and in-air micro-PIXE analysis. This paper is a description of PIXE setup and its application in biological sample for qualitative elemental analysis. The energy calibration of the system shows linearity. The minimum detection limit indicates that the system has good detection limit. The homogeneity shows uniformity of the sample itself and the internal standard within the sample. A 4 MeV He⁺⁺ion beam was used to analyze shellfish samples. Analyzing samples, it was found that the lower Z elements as well as some trace elements were detected.

DOI: http://dx.doi.org/10.3329/rujs.v39i0.16538

Rajshahi University J. of Sci. 39, 01-10 (2011)

Groundwater Balance Study in the High Barind, Bangladesh

2013-10-09T07:43:18+00:00

The annual groundwater recharge and discharge of aquifer of the Sapahar and Porsha Upazillas is estimated by Thiessen polygon method varies from 106.41 to 244 Mm³and 93.77 to 291 Mm³respectively. The calculated groundwater recharge of aquifer of the study area shows that the rate of groundwater recharge of aquifer in Porsha Upazilla is higher than that of Sapahar Upazilla and is characterized by very suitable groundwater storage potential. The overall groundwater balance study in the study area indicates that there exists a balance between annual recharge and withdrawal up to 1993 but after period of 1993 discharge exceeds the recharge continuing till today. But hereforth a cumulative annual deficit is found to exist because of progressive annual discharge in Sapahar Upazilla. 23.99 to 42.08 Mm³of groundwater is discharged by discharging mechanisms. The rest of groundwater is discharged by natural seepage.

DOI: http://dx.doi.org/10.3329/rujs.v39i0.16539

Rajshahi University J. of Sci. 39, 11-26 (2011)

Geo-electrical Resistivity Survey in the High Barind for the Delineation of Aquifer Geometry

2013-10-09T07:43:18+00:00

Geo-electrical resistivity techniques have been employed in the High Barind as a reconnaissance investigation for the subsurface lithology. Out of 13 upazillas, comprising the Barind tract, Sapahar and Porsha Upazillas, situated in the High Barind are badly affected by water shortage. Vertical electrical soundings (VES) were executed using Schlumberger configuration in different areas taking the current electrode separation up to 170 meters. Direct method technique was employed to evaluate the geo-electric layer such as resistivity and thickness of the discrete layers. The results of the resistivity survey give the subsurface information consisting of three to four layers. The results of geo-electric sounding have been compared with the geological section wherever available.

DOI: http://dx.doi.org/10.3329/rujs.v39i0.16540

Rajshahi University J. of Sci. 39, 27-37 (2011)