Calibration of radiation protection monitoring instruments by International Atomic Energy Agency

By International Atomic Energy Agency

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European intercomparison of environmental gamma dose ratemeters This programme was organized during 1984 and 1985 by the European Commission [16]. It included calibration of the instruments by different techniques as well as field measurements with the participating instruments at locations where there are different ratios of cosmic to terrestrial radiation. The energy dependence, the linearity at very low air kerma rates and the determination of the inherent response of the instruments were also investigated.

4, an example is given of a schematic 3 Filtered X rays yield as smoother energy dependence than fluorescent X rays. This may be more realistic from the point of view of operational radiation protecton because at most workplaces scattered radiation predominates. 52 TABLE IX. 52! 80! 06! 27! 55! 14 With these radiation qualities, care needs to be taken as variations in energy distribution may have a substantial influence on the numerical values of conversion coefficients. diagram of a typical calibration set-up for the fluorescence technique.

It included calibration of the instruments by different techniques as well as field measurements with the participating instruments at locations where there are different ratios of cosmic to terrestrial radiation. The energy dependence, the linearity at very low air kerma rates and the determination of the inherent response of the instruments were also investigated. During the period 1987 to 1989 further intercomparisons were made, and experiments were also conducted, investigating the response of instruments to additional exposures above normal environmental levels [17–19].

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