  The Detector Efficiency Calculator (DECal) is a series of Python functions
and tools designed to analytically calculate, visualise and optimise the
detection efficiency of thermal neutron detectors, which are based on thin-film
converters. The implementation presented in this article concerns 10B-based
detectors in particular. The code can be run via a graphical user interface, as
well as via the command line. The source code is openly available to interested
users via a GitHub repository.
