We describe here the optimisation of the RadLine™; a small, novel, remotely operated radiation detector intended for use with doses of between 0.125 and 10 mSvhr-1 in air. Tested in a beta and gamma narrow radiation field of 2.4GBq, from a Caesium-137 (662KeV) source, the RadLine™ consists of an inorganic scintillating crystal coupled to a fibre optic cable which transports produced photons to a CCD camera at the other end. Described here is the process of characterising the instrument, as well as an analysis of the signal to noise ratio both in practice and theoretically. Our results establish that the inherent noise of the CCD can be partially eliminated using a flat fielding technique. As well as demonstrating how the RadLine™ can be utilised underwater due to its partial electrical inactiveness, it was also possible to consider how the RadLine might perform in aquatic environments and ultimately in the First Generation Magnox Storage Ponds (FGMSP).