ISO 4037-1:2019 pdf free

ISO 4037-1:2019 pdf free.Radiological protection – X and gamma reference radiation for calibrating dosemeters and doserate meters and for determining their response as a function of photon energy
The second method is to produce “characterized reference fields”. Either this is done by determining the conversion coefficients using spectrometry, or the required value is measured directly using secondary standard dosimeters. This method applies to any radiation quality, for any measuring quantity and, if applicable, for any phantom and angle of radiation incidence. In addition, the requirements on the parameters specifying the reference radiations depend on the definition depth in the phantom, i.e., 0,07 mm, 3 mm and 10 mm, therefore, the requirements are different for the different depths. Thus, a given radiation field can be a “matched reference field” for the depth of 0,07 mm but not for the depth of 10 mm, for which it can then be a “characterized reference field”. The conversion coefficients can be determined for any distance, provided the air kerma rate is not below 1 μGy/h.
Both methods need charged particle equilibrium for the reference field. However, this is not always established in the workplace field for which the dosemeter is calibrated. This is especially true at photon energies without inherent charged particle equilibrium at the reference depth d, which depends on the actual combination of energy and reference depth d. Electrons of energies above 65 keV,0,75 MeV and 2,1 MeV can just penetrate 0,07 mm, 3 mm and 10 mm of ICRU tissue, respectively, and the radiation qualities with photon energies above these values are considered as radiation qualities without inherent charged particle equilibrium for the quantities defined at these depths.
For the “matched reference radiation field” all the quite strict requirements as summarized in Table 13 shall be fufilled for the radiation quality and the phantom definition depth under consideration. Due to the strictness of the requirements, no characterization of the field parameters, e.g.. regarding spectral distribution, is required and the air kerma-to-dose-equivalent conversion coefficients ( hereinafter abbreviated as“ conversion coefficients”) recommended in ISO 4037-3 shall be used. This method requires a validation of the “matched reference radiation field” to assure that the deviations of the actual parameters from their nominal values are within acceptable limits.ISO 4037-1 pdf free download.