Geological Survey of India is having three Scanning Electron Microscopes with Energy Dispersive X-ray Spectrometers in Kolkata, Hyderabad and Lucknow Office.

The SEM-EDX is capable of capturing ultra structural details of samples as images in film and in digital mode. The instruments can magnify specimens up to 3, 00,000 times. The surface features are best seen in Secondary Electron image while compositional and topographical images can be seen with Back Scatter Electron image.

With the help of EDX, both qualitative and quantitative microanalysis can be done by nondestructive method. Elements from Boron to Uranium with a detection limit of 100 ppm can be analyzed. GSI has qualified and trained officers to carry out the study along with other scientists from the user agencies. Besides providing routine services to various Operations and Regions of GSI for mineral investigation, environmental, mineralogical, palaeontological and palaeoclimatic studies, services have been provided to outside organizations of international repute like Indian Toxicological Research Centre (CSIR), Central Institute of Plastic Engineering & Technology, Indian Veterinary Research Institute, King George Medical University, King George Dental University, etc for study of kidney stones, tooth samples, metal fused porcelain, rubber polymer, chemically treated sand and bone samples.

Samples from outside agencies are studied on payment basis. The facility is extended to outside departments at a charge of Rs 1089=00 (plus applicable service tax) per hour. Work is done by prior appointment only.

Services available

• Micro analysis : Super atmospheric thin window (SATW); Resolution 130 eV detection; Detection range-Boron(5) to Uranium(92); Detection limit- 0 to 1%; Minimum area of analysis-1 mm dia x depth
• Data presentation-
• SEM micrographs
• 35 mm 100 ASA roll films
• Thermal paper video print processor
• EDX micro analysis
• X-ray spectrum tabular chart of elemental analysis in Wt % and At %
• Negative film to be provided by the user (original cassette, 100/125 ASA, B/W 35 mm)

Which type of samples can be studied?

• Rocks, minerals, fossils, ores, biological, pharmaceutical, metallurgical, polymer samples, etc. are suited for SEM / EDX studies.
• Samples should be dry, clean and sized.
• Samples should be of maximum 20 mm diameter and with a height of 5mm.
• Samples for EDX microanalysis should be polished and made parallel to the surface of the stub.
• Labile, wet, oily / greasy samples are not fit for study.

Information to be provide while submitting samples

• Nature of samples
• Objective of the study
• Number of expected SEM micrographs to be taken
• Number of expected microanalysis location / spot
• Sample history, especially geological ones, comprising the nature, stratigraphy and geographical location.

For further information please contact: