BS IEC 61017:2016 pdf download – Radiation protection instrumentation — Transportable, mobile or installed equipment to measure photon radiation for environmental monitoring
3.4 Quantities and units In this standard, units of the International System (SI) are used 1 . The definitions of radiation quantities are given in IEC 60050-395. The corresponding old units (non SI) are indicated in brackets. Nevertheless, the following units may also be used:
– for energy: electron-volt (symbol: eV), 1 eV = 1 ,602 × 1 0 –1 9 J;
– for time: years (symbol: y), days (symbol: d), hours (symbol: h), minutes (symbol: min). Multiples and submultiples of SI units will be used, when practicable, according to the SI system. 4 General test procedure 4.1 Nature of tests Unless otherwise specified in the individual clauses, all tests enumerated in this standard are to be considered as “type tests”. Nevertheless, by agreement between the manufacturer and the purchaser, some of them may be considered as acceptance tests.
4.2 Reference conditions and standard test conditions Reference and standard test conditions are given in Table 1 . Reference conditions are those conditions to which the performance of the instrument is referred and standard test conditions indicate the necessary tolerances in practical testing. Except where otherwise specified, the tests in this standard shall be performed under the standard test conditions given in the third column of Table 1 .
4.3 Radiation performance tests The radiation performance tests are listed in Table 2, which indicates, for each characteristic under test, the requirements according to the clause where the corresponding test method is described. The tests shall be performed under test conditions detailed in Table 1 , except for the quantity being tested.
4.4 Tests performed with variation of influence quantities The classification of electrical, mechanical and environmental characteristics tests is shown in Table 3. Those tests are intended to determine the effects of variations in the influence quantities given in Table 4 and Table 5. All other influence quantities shall be maintained within the limits for the standard test conditions given in Table 1 unless otherwise specified in the test procedure concerned.
4.5 Statistical fluctuations For any test involving the use of radiation, if the magnitude of the statistical fluctuations of the indication arising from the random nature of radiation alone is a significant fraction of the variation of the indication permitted in the test, then sufficient readings shall be taken to ensure that the mean value of such readings may be estimated with sufficient accuracy to demonstrate compliance with the test in question. The interval between such readings shall be sufficient to ensure that the readings are statistically independent.
4.6 Reference radiation All tests shall be conducted with 1 37 Cs unless specified otherwise. As an alternative, 60 Co may be used. In this case, correction shall be made for the difference in response of the detector assembly between 60 Co and 1 37 Cs. These radiation qualities are specified in ISO 4037 series.
4.7 Point of test The point of test at which the photon dose rate is to be determined shall be chosen such that the distance between the radiation source and the detector assembly shall be sufficiently large to ensure that any error due to the non-uniformity of irradiation of the detector is not more than ±5 %.
5 General requirements
5.1 Summary of requirements
In Table 2, Table 4, and Table 5 the requirements are summarized.
5.2 General characteristics
5.2.1 Energy and measurement range
The equipment shall measure the air kerma (rate), air absorbed dose (rate) or ambient dose equivalent (rate) to photon energies over a range of at least 80 keV to 3 MeV. The dynamic
measurement range of the equipment shall be at least three orders of magnitude.
5.2.2 Effective range of dose rate and dose The effective range of dose rate and dose meters shall be from 30 nGy⋅h –1 or 30 nSv⋅h –1 to at least 30 µGy⋅h –1 or 30 µSv⋅h –1 . Where the instrument is to be used during emergency conditions, the upper limit should be at least 1 mGy⋅h –1 or 1 mSv⋅h –1 . The indication of integrating assemblies shall be expressed in units of air kerma or air absorbed dose, Gy or in units of ambient dose equivalent, Sv. For most applications, the effective range of measurement shall be at least from 1 0 nGy or 1 0 nSv to 1 0 mGy or 1 0 mSv. The requirements of this standard are also applicable where an assembly has an upper limit higher than 1 0 mGy or 1 0 mSv. Where more than one detector is used for measurement over the complete range, automatic switching shall be provided between the detectors when changing range, and the corresponding measurements and read-out scale shall be simultaneous. The specification and configuration of the system using two detectors is exemplified in Annex C.