Program title: COLONEMA
Catalogue identifier: AEYS_v1_0
Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AEYS_v1_0.html
Program obtainable from: CPC Program Library, Queen’s University, Belfast, N. Ireland
Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html
No. of lines in distributed program, including test data, etc.: 2900
No. of bytes in distributed program, including test data, etc.: 18753
Distribution format: tar.gz
Programming language: C++.
Computer: Unix/Linux workstations and PC.
Operating system: Unix, Linux and windows, provided a C++ compiler has been installed. Examples were 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 2 GB of virtual memory.
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 the 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 min on an Intel Xeon X5550 2.676 GHz processor to run the example presented.