The Radiation Area Monitor (RAM) is a small set of thermoluminescent detectors encased in Lexan plastic that respond to radiation; the amount of radiation they absorb can be revealed by applying heat and measuring the amount of visible light released. The RAM is used to monitor dose and dose equivalent within the habitable volume of the International space Station (ISS) as a function of location, due to its predicted low sensitivity to high-Linear Energy Transfer radiation (neutrons and alpha particles).Facility Manager(s)
Facility Developer(s) Information PendingSponsoring Agency
National Aeronautics and Space Administration (NASA)Expeditions Assigned
2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19/20,21/22Previous ISS Missions
The Radiation Area Monitor (RAM) is a small set of thermoluminescent detectors (TLD) encased in a Lexan holder. The material responds to radiation via electronic excitation states in the various TLD materials. After exposure, the amount of absorbed energy (dose) is determined by applying heat and measuring the amount of visible light released as these excited states are returned to equilibrium. RAMs are placed in throughout the volumes of both the ISS and the Space Shuttle. The ISS monitors are swapped out during the periodic Shuttle missions.
RAMs are attached to structures distributed throughout the ISS (4-6/module; 2-4/node). Data are stored and analyzed postflight to determine ISS radiation levels.