|Author||Pathak, Madhulika ♦ Gupta, Shaibal ♦ Bhattacharya, Debashis ♦ Rao, M. K. ♦ Bhaumik, B. K.|
|Publisher||Indian J. Phys.|
|Subject Domain (in DDC)||Natural sciences & mathematics ♦ Physics|
|Subject Keyword||Portable gamma ray spectrometer ♦ 1K MCA ♦ Th distribution|
|Abstract||Indigenously fabricated portable gamma-ray spectrometer (PGRS) is used for the measurementof gamma activity of 214Bi (1.76 MeV) and 208TI (2.62 MeV), under field conditions in Mohar area, Shivpuri Distt.(MP). The energies are discriminated by using a Nal (TI) crystal of size 1.75" × 2". PGRS used to map theprimordial elemental distributions shows reversals of concentration of thorium and uranium (represented byradium group) in field and lab analysis in many samples, which is attributed to the inhomogenity of distribution ofthese elements in the area. The concept of difference in the volume of dish shaped field sample and the randomlypicked up sample from the field grid point (400 gm in lab analysis) is utilized to interpret the inhomogenity of theseelements. However interpretations are based on the assumption that these primordial elements (U, Th) are insecular equilibrium and the terrain has low topographic relief.|
|Education Level||UG and PG|
|Learning Resource Type||Article|
|Journal||Indian J Phys|
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