Document Detail

Developing a correlation index and U disequilibrium factor for the exploratory boreholes in Wahkut block of West Khasi Hills district, Meghalaya (India).
MedLine Citation:
PMID:  23202436     Owner:  NLM     Status:  Publisher    
With the objective to affirm the apparent uranium ore zone grade/thickness with good confidence for the non-cored as well as those boreholes with poor core recovery in the sedimentary environment of Wahkut block, West Khasi Hills district of Meghalaya, a systematic study between the in situ measured γ-ray logs under field conditions and laboratory analyzed core assay under controlled conditions has been carried out. The study area spans 2sqkm having 33 cored and 39 non-cored boreholes with a cumulative drilled depth of about 11,000m. On this available cored borehole database, simultaneous uranium ore zone continuity, both for in situ γ-ray logs and radiometric core assay, was evaluated with the experimental parameters of 1.0m ore zone thickness at 0.010% eU(3)O(8) cut off grade. A population of 18 such simultaneous qualifying zone (borehole log and core assay) across the 15 cored boreholes gave a grade thickness continuity index of 0.92 with a moderately strong relationship between the radiometric core assay and the in situ γ-ray logs. After validation of an in situ uranium ore zone, study boreholes were examined for their uranium disequilibrium status by fitting regression equations for the radiometric U(3)O(8)(β/γ) and spectrometric radium measurements, done on the borehole core samples. A parent favoring uranium disequilibrium was observed in the sedimentary environment of Wahkut block, with a log normal distribution. An average uranium disequilibrium factor 1.46±0.245 was estimated for the 19 study boreholes, across the block.
B M Kukreti; Pramod Kumar
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-9
Journal Detail:
Title:  Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine     Volume:  72C     ISSN:  1872-9800     ISO Abbreviation:  Appl Radiat Isot     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-12-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9306253     Medline TA:  Appl Radiat Isot     Country:  -    
Other Details:
Languages:  ENG     Pagination:  6-10     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Ltd. All rights reserved.
Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Nongmynsong, Shillong 793019, Meghalaya, India. Electronic address:
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