BS IEC 60846-2-2015 pdf free download – Radiation protection instrumentation — Ambient and/or directional dose equivalent (rate) meters and/or monitors for beta, X and gamma radiation Part 2: High range beta and photon dose and dose rate portable instruments for emergency radiation protection purposes.
5.16Protection of switches
Switches and other controls shall be protected to prevent inadvertent de-activation or mal-operation of the instrument.
5.17Use of extension probe
lf an extension probe is to be used, the instrument including the probe and all associatedequipment necessary for measurements including the extension device extended to the worstcase configuration shall be tested. Details of the test method shall be made available alongwith the results.
5.18Contamination probe
Emergency dose rate monitors are frequently provided with a surface contamination probe.This probe shall meet the requirements of lEC 60325.
6 General test procedures
For the purposes of this standard, 6.1 to 6.14 of IEC 60846-1:2009 apply，withoutmodifications.
7Additivity of indicated value
For the purposes of this standard, 7.1 to 7.3 of IEC 60846-1:2009 apply，withoutmodifications.
8 Radiation performance requirements and tests
For the purposes of this standard,8.1 to 8.13 of IEC 60846-1:;2009 apply，withoutmodifications，except as stated in the following subclauses. The changed subclauses areidentified by the same number as in lEC 60846-1:;2009 or,for new subclauses, by a highernumber not used in IEC 60846-1:2009.
8.4 Variation of the response due to photon radiation energy and angle of incidence8.4.3Measuring quantity H”(0,07)，H(0,07), H*(10) or H*(10) for telescopic or
remote cylindrical probes
8.4.3.1
General
Where telescopic or remote cylindrical probes with their calibration direction perpendicular tothe axis of symmetry are used for emergency instrumentation, this subclause 8.4.3 replaces8.4.1 and 8.4.2 of IEC 60846-1:2009. in all other cases, subclauses 8.4.1 and 8.4.2 ofIEC60846-1:2009 apply, without modification.
8.4.3.2Requirements
The variation of the relative response due to a change of the photon radiation energy andangle of photon radiation incidence shall not exceed the following values;
. -29 % to 67 % for photon radiation energies of 80 keV to 1,5 MeV and angle of photon radiation incidence of o” to 土60″ and 180~ to (180° + 60~).
-37,5 % to 150 % for photon radiation energies of 80 keV to 1,5 MeV and angle of photonradiation incidence of i60° to ±120 °; however，at angle of photon radiation incidence of90°+10 a lower response of -50 % is allowed.
-37,5 % to 150 % for photon radiation energies of 1,5 MeV to 7 MeV and angle of photon
radiation incidence of o to +60° and 180° to (180° ±6o°).
All indicated dose values shall be corrected for non-linear response and, if necessary, for theeffect of the influence quantity dose rate.
Where more than one detector is utilized，then these requirements shall apply to eachdetector.
NOTE The range of the response -29 % to +67 % corresponds to the range of the correction factor 1,00 ±0,40.The range of the response -37,5 % to 150 % corresponds to the range of the correction factor 1,00 ±0,60.
8.4.3.3 Method of test
The tests with X-rays should be performed using the narrow-spectrum series of radiationqualities of lSO 4037-1，however if very high dose rates are required，the wide-spectrumseries or high air kerma rate series may be required.
ln order to minimize the number of measurements, in a first step the minimum rated photonenergy is determined where both requirements on energy and angular dependence ofresponse are met:
The energy dependence of response for angles of incidence of a = 0°normalized to itsvalue at 137cs gamma energy，R(Ep0°)，is measured and plotted versus the photonenergy at the points of the mean energies (fluence weighted) of the used X-ray spectra,Ey.The photon energy where the variation of the relative response falls outside -29 % to+67 % (for 80 keV up to 1,5 MeV) or outside -37,5 % to +150 % (for 1,5 MeV up to 7 MeV)is determined.
For the radiation quality with the mean energy above the lower photon energy thusdetermined, the relative response is measured for all angles between 0° and 180°at 15°intervals in two perpendicular planes containing the reference direction through thereference point of the dose equivalent (rate) meter.
– lf for this radiation quality, all variations of the relative response are between -29 % to
+67 %(for 80 keV up to 1,5 MeV and 0° to ±60° and 180° to {180°+60°)) and between-37,5 % to +150 % (for 80 keV up to 1,5 MeV and ±60° to ±120°; however at 9o° thevariation of the relative response is allowed to be as low as -50 %) and between-37,5 % to 150 %(for 1,5 MeV up to 7 MeV and 0° to ±60° and 180° to {180°±60°}, theprocedure shall be repeated with the radiation quality with the next lower mean photonenergy.
– Otherwise, the radiation quality with the higher mean energy shall be chosen.BS IEC 60846-2 pdf pdf download.