The Linear Energy Transfer (LET) Spectrometers (LETS), developed by STILRAD are designed to measure the spectra (in 256 channels) of the deposited energy from primary and secondary ionizaition particles in different environoment: in the underground, military and civil areas, at the aircraft altitudes, at Low Earth Orbits (LEO), outside of the Earth magnetosphere on the route and on the surface of the planets of Solar system. It sensitivity was proved against neutrons and gamma radiation, which allows monitoring of the natural background radiation also.
The LETS is a miniature spectrometer-dosimeter containing:
- one semiconductor
- detector,
- one charge-sensitive preamplifier,
- one or more microcontrollers and
- memory.
LETS devices consists (GPS) receiver. Pulse analysis technique is used for the obtaining of the deposited energy spectra, which further is converted to the deposited dose and flux in the silicon detector. The device is managed by the microcontrollers through specially developed firmware. Plug-in links provide the transmission of measured data to a dedicated memory or server.
A built-in computer is used for the full management of the LETS, preliminary data processing and visualization implementing interactive user-friendly interfaces.
| MODEL | DESCRIPTION | |
Liulin-6SA1 MDU-3 L1  | Parameter Value Si Detector Thickness DT [mm] 0.300 Si Detector area DA [cm -2] 2 Si Detector mass DM [kg] 0.0001398 Amplifier Sensitivity AS [V/MeV] 0.24 Number of ADC channels 256 Threshold level TL [keV] 40 Typical power consumption 12 V DC, 17 mA Dimensions 110x40x20 mm Weight 0.092 kg Shielding before the detector 0.5 mm Al+ 0.5 mm air + 0.1 mm Cuprum+ 0.2 mm Plastic Range min max Temperature [°C] -20°C +50°C Dose rate [Gy/h] 1.12-08 0.188 Flux [cm-2 s-1] 0.01 10000 Deposited energy range [MeV] 0.081 20.833 *Maximal thermal flux 300 mW *Voltage input: 8 -15 V DC *Maximum 20 mA current | |
L2  | ||
L3 | ||
| L4 | ||
| L5 | ||