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Manuscript Title: COunt LOss in NEutron Multiplicity Assessment (COLONEMA)
Authors: C. Carasco
Program title: COLONEMA
Catalogue identifier: AEYS_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 200(2016)285
Programming language: C++.
Computer: Unix/Linux workstations and PC.
Operating system: Unix, Linux and windows, provided a C++ compiler has been installed. Examples where tested under Debian Linux.
RAM: Depends on the simulated neutron source strength and detector efficiency. !at most, the example presented in the article allocates about 2GB of virtual memory.
Keywords: Neutron coincidence counting, Dead time correction, Fissile material assay, Monte Carlo.
PACS: 28.20.Gd, 28.41.Te, 24.10.Lx.
Classification: 11.7, 17.7.

Nature of problem:
To determine the mass of fissile materials inside an unknown object, a passive neutron multiplicity or coincidence counting is performed in which single, double and triple neutron rates are measured. The measured rates must however be corrected from count losses due to dead time when the count rate is large.

Solution method:
Unlike approaches based on time consuming Monte Carlo transportation of them neutrons in the inspection system combined with treatment that take into account count losses due to dead time, a versatile Monte Carlo approach is presented which uses only the detection efficiency of the system and the dead time of the electronics and counters.

Running time:
It takes about 109 minutes on an Intel Xeon X5550 2.676 GHz processor to run the example presented.