BS IEC 62534:2010 pdf – Radiation protection instrumentation— Highly sensitive hand-held instruments for neutron detection of radioactive material.
• unique serial number,
• location of the reference point, and
• function designation for controls, switches, and adjustments that are not menu or software driven.
Markings shall be easily readable and permanently fixed under normal conditions of use (including use of normal decontamination procedures).
4.9 Power supply
4.9.1 R.qulr.m.nts
Instruments shall be equipped with a test circuit or other visible direct indicator of battery condition for each battery circuit.
The manufacturer shall state the expected continuous operating time using the recommended batteries and the conditions (functional and environmental) used to determine this time.
The instrument shall be fully operational for a minimum of 8 h after warm-up under standard test conditions The low.battery indication shall be no lower than the minimum voltage required for proper operation.
If operated using consumable batteries, the batteries shall be widely available, not unique to the instrument, and be field replaceable (e.g., AA) with no special tools Battery chargers shall meet appropriate electrical standards.
4.9.2 External DC or AC power
The instrument should be capable of operating from an external DC or AC source. Adequate protection from reverse polarity, over-voltage, and electrical noise shall be provided. AC or DC power sources may Include:
a) 12 V DC as would be obtained from a 12-volt vehicle electrical system.
b) A portable battery pack, such as one that can be worn, that supplies 4 V DC to 28 V DC.
C) A regulated 12 V DC power supply operating from mains power.
d) A single phase 100 V AC to 240 V AC 50 Hz — 60 Hz power supply. Requirements are verified by observation of the instrument and review of manufacturer- provided information.
4.10 Protection of switches
Switches and other controls should be protected to minimize or prevent inadvertent deactivation o improper operation of the instrument.
4.11 DIsplay units
Neutron indication shall be in counts per second,
4.12 EffectIve range of measurement
The neutron energy range shall be from thermal to fast neutrons with tests performed using moderated and unmoderated 2C1.
The manufacturer 5hall also state the range for neutron count rate indication.
4.13 Alarms
4.13.1 Source IndicatIon alarm
A source indication alarm shall be provided when the measured neutron field (count rate) is above the source indication alarm threshold. This alarm threshold shall be calculated by the instrument from the background measurement by adding a user-defined count rate increment or number of standard deviations (depending on instrument operating mode) The alarn shall be both audible and visual, and not be affected by slowly increasing radiation fields that could cause a slow change in the alarm threshold. It shall not be possible to switch off all alarm indications at the same time
4.13.2 Personal protection alarm
Alarms shall be provided to alert the user when the measured neutron field (counts per second) or the photon radiation field intensity are above a user-selected threshold level (typically 100 pSv.h1) Each alarm shall be audible and visual, be different from the neutron source indication alarm, and adjustable through the restricted mode. For the personal protection photon radiation alarm, the alarm value shall be based on ‘37Cs For neutron, the alarm value shall be based on the spectrum from 2S2C1,
The personal protection alarm shall be functional over the stated range of the instrument
4.14 ExplosIve atmospheres
The manufacturer shall state as to whether the instrument is certified for use in explosive atmospheres and its category. Proof of certification shall be provided when claimed.
4.15 IndIcation features
The instrument shall provide an indication of its operational status and alarm condition. The user shall have the ability to select the visibility of the status indication.
All alarm indicators shall automatically or manually reset as defined by the user.
5 General test procedure
5.1 Natur, of test
Unless otherwise specified in the individual steps, all tests enumerated in this standard are to be considered type tests. Certain tests may be considered acceptance tests by agreement between the purchaser and the manufacturer.
When performing radiation tests as described in this standard, the reference point of the instrument shall be placed at the point of measurement and the instrument shall be oriented with respect to the direction of the radiation source as indicated by the manufacturer.