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Project ID: FIGM-CT-2000-00068
Finanziato nell'ambito di: FP5-EAECTP C
Paese: Ireland

DIAS detector calibration

The DIAS group employs solid state nuclear track detectors to investigate cosmic and solar energetic particles at aircraft altitudes. These particles include protons, neutrons and heavy ions such as helium, carbon etc. which are present in the primary radiation that strikes the upper atmosphere and are also present in the nuclear interaction products that result from collision with the molecules in the Earth’s atmosphere. The high speed particles leave a trail of damage in the detectors, which when duly processed, can be magnified, optically measured, and related to the charge and velocity of the particle.

The relationship between the energy deposited in the detectors (the Linear Energy Transfer, LET) and the measured signal is determined by calibrating the detectors with protons and heavy ions of known energy at various accelerators. Once the LET values are known, the radiation dose can be determined. The DIAS detectors were calibrated over the range 5KeV/mm to 600KeV/mm which covered the LET region of interest for dose measurements at altitude in the Earth’s atmosphere. Repeated calibrations over a number of years showed excellent consistency and confirmed the reliability of this fundamental approach to high accuracy data for dosimetric purposes in aircraft and space.

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Reported by

Dublin Institute for Advanced Studies
5 Merrion Square
2 Dublin
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