Community Research and Development Information Service - CORDIS


DOSMAX Report Summary

Project ID: FIGM-CT-2000-00068
Funded under: FP5-EAECTP C
Country: United Kingdom

Instrument calibration

It is necessary to determine the neutron and photon response characteristics of the NRPB passive survey instrument used for the measurement of cosmic radiation fields in aircraft and in low earth orbit. Both the energy and angle dependence of response need to be determined. This work is important for the assessment of the radiation exposure of aircraft crew.

The NRPB passive survey instrument can be used for routine measurements to validate calculated route doses. Exposure to cosmic radiation is considered to be occupational exposure, and in Europe, requirements for dose assessment are given in the European Council Directive 96/29/EURATOM, which have been, or are being incorporated into the national legislation of EU Member States, and in the forthcoming revised Joint Aviation Regulations to be issued by the Joint Aviation Authority (which covers the activities of the civil airlines of 35 European states).

The neutron and photon response characteristics of the NRPB passive survey instrument have been determined for neutron energies from 144keV to about 200MeV and for photons of energies 662keV and 4.4 and 6/7MeV. The angle dependence of response has been measured. The reproducibility of the PADC detector sensitivity has been determined by a series of repeated measurements in the CERN high energy calibration facility which simulates the neutron component of the cosmic radiation field in aircraft.

An assessment of the uncertainties has been made.

Reported by

National Radiological Protection Board
Chilton, Didcot
OX11 0RQ Oxon
United Kingdom
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