NDLI: A combined weight window and biasing approach based on a subspace importance map in the Monte Carlo simulation of gamma-gamma lithodensity logging tool responses with the revised McLDL code

Content Provider	IEEE Xplore Digital Library
Author	Ao, Q. Gardner, R.P. Verghese, K.
Copyright Year	1963
Abstract	A combined weight window and biasing approach has been developed to optimize the specific purpose McLDL code for simulating the spectral response of gamma-gamma lithodensity logging tools. The method is based on the use of photon importance maps which are strongly dependent upon the geometric configuration of the logging tool. A subspace in the formation is taken as an importance region and a one-group importance generator is used in conjunction with the current McLDL code. The splitting of a photon only occurs within the important subspace, and direction biasing and the exponential transform are applied to drive photons into that region or the detector. The approach has been tested on a computational benchmark problem and the Atlas Wireline Services' commercial gamma-gamma lithodensity logging tool. Compared to the results from the previous McLDL code, this new approach has eliminated the unacceptably large weight fluctuations and substantially improved the code's performance in computational accuracy and efficiency by decreasing the relative standard deviation in total detection yield by an order of magnitude and increasing the figure of merit by more than 70 times. Also, the revised McLDL code is more efficient than the general purpose Monte Carlo code MCNP in the simulation of gamma-gamma lithodensity logging tool responses.<>
Sponsorship	IEEE Nuclear and Plasma Sciences Society Computer Applications in Nuclear and Plasma Sciences (CANPS) Lawrence Berkeley Lab. Lawrence Livermore Nat. Lab. APS College of William and Mary Continuous Electron Beam Accelerator Facility NASA Defence Nuclear Agency Sandia National Laboratories Jet Propulsion Laboratory Brookhaven Nat. Lab. Lawrence Livermore Nat. Lab IEEE/NPPS Radiat. Effects Committee Defence Nuclear Agency/DoD Sandia National Laboratories/DOE Jet Propulsion Laboratory/NASA Phillips Lab./DoD
Starting Page	626
Ending Page	633
Page Count	8
File Size	806080
File Format	PDF
ISSN	00189499
Volume Number	42
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Monte Carlo methods Density measurement Well logging Petroleum Gamma rays Collimators Gamma ray detection Gamma ray detectors Solid scintillation detectors Electromagnetic scattering
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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