Flight Radiation Environment Detector FRED
The goal of the experiment is to measure the altitude-dependency of the radiation exposure in the atmosphere during Solar minimum conditions. For this purpose, we are developing a dosimeter, consisting of four segmented silicon-semiconductor-detectors, which are arranged in telescope geometry. Due to this arrangement the telescope has an opening angle of 120°. Figure 1 shows a schematic of the detector arrangement.
Due to the telescope geometry we are able to measure the Linear Energy Transfer (LET) of particles using a coincidence condition. This information allows us to calculate a dose equivalent, which takes into account the biological effectiveness of radiation and is the common unit used in radiation protection. Measuring in coincidence condition means that a particle has to make a signal in both detector A and D (see figure 1). Then, it is possible to calculate the LET of that particle.. The detector C possesses a neutral channel (depicted in red in figure 1) that allows us to measure neutrons and gamma particles. This channel is surrounded by an anticoincidence of silicon, which enables us to distinguish between neutral and charged particles. Particles, that are only detected in the neutral channel but not in the surrounding anticoincidence, are classified as neutral particles. This allows us to analyse charged and neutral particles separately.
The second picture displays the experiment FRED. The dimension from FRED is 10x12x10 cm. The detectors are located in the upper Part of instrument. Due to the housing is made of magnesium the whole instrument has a heaviness of 391g. The whole power consumption is 2.8W and the measuring range is from 65keV up to 280MeV.
- dimension: 10x12x10 cm
- weight: 391g
- detectoren: 4 segmented silicon detectors
- teleskop opening angle:120°
- measuring range: 65keV - 280MeV
- power consumption: 2,8W
- storage: micro SDHC Karte
- ethernet: UDP