tokens: The protection limits and predicted exposure used to determine the achieved RDM for biological effects shall be defined in terms of one or more of the following variables : 1 . effective dose ; 2 . organ equivalent dose ; 3 . ambient dose equivalent ; 4 . directional dose equivalent ; 5 . personal dose equivalent . NOTE 1 For requirements on radiation effects in biological material , see Clause 11 . For background on limit exposure policies of the different Space Agencies , see ECSS - E - HB-10 - 12 Section 10.4.4 . NOTE 2 For interplanetary missions , exposure limits are not currently defined .