[en] Radiation dosimetry in space presents one of the few remaining challenges in the field of radiation protection. This arises mainly from the highly complex nature of the radiation fields encountered in space leading to serious problems in the interpretation of data recorded by dosimetric devices, e.g., there are currently large uncertainties in the estimation of the neutron and HZE contribution to the total dose equivalent. The current approach has been to use a number of passive detectors, each capable in principle of measuring a different component of the radiation field - certainly a heroic task. LiF-TLDs are the most commonly used passive detector, however, these are said to provide no LET information (not true), and tend to underestimate the total dose due to a decreasing TL efficiency with increasing ionisation density (LET). Attempts have recently been made to convert the heavy charged particle and neutron induced component of LiF-TL signals to radiation dose equivalent but these are almost surely/inevitably very inaccurate