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- W103409600 abstract "It is becoming commonplace in the well-logging industry to simulate many different types of nuclear well-logging techniques using Monte Carlo neutron/photon transport codes, such as MCNP, to fill the gaps where experimental data are not available. However, Monte Carlo simulations can become very time consuming because a large number of particle histories are usually necessary to obtain results that are both accurate and precise enough to formulate new and improved well-logging algorithms. The Los Alamos National Laboratory has been investigating several different methods of obtaining more accurate and precise results of the formation lifetime using fewer particle histories. One of these methods is based on sampling only neutron histories rather than coupled neutron/photon histories. The basic premise for this method is that the majority of photons produced in the formation during late times are generated only by neutron capture events. Hence, changes in the time-dependent history of the photon flux striking the detectors should follow the neutron absorption rate in the formation. Using this methodology, the formation lifetime can be estimated accurately by using just a few particle histories and a simple definition of a neutron lifetime. To demonstrate this methodology, the authors simulated a die-away experiment in a largemore » water tank. Using the traditional time-dependent, photon-flux method, it was necessary to run 5,000,000 neutron histories to obtain a formation lifetime that was within 0.1% of the assumed correct value of 204.7 {micro}s. In contrast, using the newer neutron-lifetime method, they were able to obtain the correct formation lifetime with a single neutron history. This newer neutron-lifetime method, therefore, represents a significant reduction in particle histories and, consequently, a significant reduction in computing time.« less" @default.
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- W103409600 date "1998-09-01" @default.
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- W103409600 title "Simulation of neutron/photon die-away in a pure water system using MCNP4B" @default.
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