European Space Agency

MIRAM Miniaturised Radiation Monitor


The objective of the project is to design, develop and test four prototypes of Miniaturised Radiation Monitor (MIRAM) which

  • is planned for GEO Telecom satellite missions to monitor the cosmic radiation dose
  • is based on pixel detector TimePix,
  • is designed for 12-15 years of latch-free operation,
  • is small with an order of magnitude reduction in the mass and volume as compared to previous radiation monitors,
  • has lower complexity and replaces expensive materials compared to previous solutions,
  • has reduced power consumption.


Main technical requirements for MIRAM

  • Miniaturisation
  • Power dissipation <1W
  • Weight <150g
  • Dosimeter for accumulated total dose + particle identification
  • low price


The radiation monitor MIRAM is based on one of the best available technology for particle detection - Timepix. It allows for significant reduction of the size of the device as the dimension of the Timepix chip has size of just 14mm x 14mm and weighs only a fraction of a gram. At the same time, it offers an unprecedented performance of particle detection, tracking and recognition, as it consists of 256 x 256 silicon pixels of which each operates as an individual particle detector by its own.


  • particle species identification
  • continuous dosimeter
  • particle flux up to 107 (#/cm2/sec)

System Architecture

The architecture of the device is based on a hybrid active pixel detector technology with diodes and shielding. The heart of the design is the Timepix chip with the read-out electronics. The particle species identification is designed with the sophisticated combination of the pulse height analysis, the coincidence scheme with absorbers and the analysis of cluster shapes and energy depositions.


The project is planned to take a total of 32 months. The outcome of the first year is a full design of the MIRAM device supported by simulations and tests of main components. The outcome of the second year is a production of four prototypes of MIRAM. The rest of the project period is dedicated to the prototype validation and irradiation testing, and to creating a MIRAM flight units development plan proposal.

Current status

At the end of the first year of the project, the design of breadboards of the LPC and ACQP parts has been completed. The outcomes of this year’s work packages will be presented and defended during the Milestone meeting 1 in ESTEC.


Status date

Tuesday, July 9, 2019 - 08:39