The 'history' of the extended range neutron rem counter LINUS, since its first conception in 1990, is reviewed, along with the latest developments. These include the calibration of the initially cylindrical version with nearly monoenergetic neutrons in the energy range 34-66 MeV, a detailed evaluation of the anisotropy of its response function, the construction and calibration of an improved spherical version, and recent measurements in reference high energy stray radiation fields. The instrument can now be considered as being fully characterised. Similar monitors built by other laboratories following the present design have confirmed its performance. The instrument is now in semi-routine use at a number of particle accelerator facilities and is one of several devices used on-board aircraft for assessing the exposure to cosmic rays at commercial flight altitudes.
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Birattari et al. (1998) studied this question.
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