By International Atomic Energy Agency
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Additional info for Calibration of radiation protection monitoring instruments
G. differences in air density); is the measured (indicated) value of the reference instrument divided by the corresponding value of the instrument under calibration at test point No. e. g. differences in air density); is the coefficient to convert from the quantity measured by the reference instrument to the dose equivalent quantity associated with the instrument under calibration. 2. Determination of response as a function of energy and angle of incidence The reference points of the reference instrument and of the instrument whose response should be determined in terms of the dose equivalent quantity, H, are positioned simultaneously at the two symmetrical points of test in the radiation field.
Method 1: calibration with a reference instrument without any monitor; method 2: calibration with a reference instrument and with a monitor; method 3: calibration by simultaneous irradiation of reference instrument and instrument under calibration; method 4: calibration in a known radiation field. 0 10 100 Eph 1000 keV FIG. 6. 07,0°) for monoenergetic photon radiation of energy Eph. Numerical values of conversion coefficients are given in Sections 4 and 6 for a number of reference radiations. g.
15 For quantities that refer to the measurement at a depth in a material where the attenuation of the fluorescent X ray lines may be significant, the spectral distribution of the Compton scattered impurities may have a dominant response on the device being calibrated. As a consequence of such spectral impurities, it will be extremely 54 TABLE XII. 4 102 122 146 147 The values listed in this table have been taken from Seelentag et al. . The length of air path employed, which has been included in the additional filtration, is significant for the lower energy radiations.
Calibration of radiation protection monitoring instruments by International Atomic Energy Agency