ISO 21909:2005 pdf free.Passive personal neutron dosemeters -Performance and test requirements.
4 Units
This International Standard uses SI units. However the following units of practical importance for time are used where necessary: days (d) and hours (h).
5 General test conditions
5.1 Test conditions
AllI tests shall be performed under standard test conditions (see Annex A), except where otherwise stated. The actual conditions should be indicated in the test report. They should not undergo large or rapid changes during a series of measurements.
Irradiation of dosemeters shall be performed on a phantom in terms of personal dose equivalent for the energy and angle dependence of response tests. For the other tests, dosemeters may be irradiated free-in-air and reference quantity could be neutron fluence.
5.2 Reference radiation
The reference radiation fields defined in ISO 8529-1 shall be used. In addition, simulated workplace neutron fields may be used (ISO 12789). For many of the tests, it is sufficient to use only one neutron source (e.g. 241Am-Be or 252Cf neutron sources). Information on irradiation conditions is found in Annex D.
NOTE For TLADs, any neutron source with adequate low-energy neutron intensity, the more moderated the better,can be used for the tests.
5.3 Test requirements
All detectors and dosemeters shall be subjected to the preparation, handling and read-out recommended by the manufacturer. Packaging, handling and processing of the detectors and dosemeters govern their performance that is generally assessed under laboratory conditions. As these conditions can never adequately simulate the conditions actually experienced in practical personal dosimetry, caution is therefore necessary when applying the results of these performance tests in real situations.
6 Performance requirements
The following general requirements apply to the tests for all detectors and dosemeters.
a) The tests are performed on a specified number of dosemeters randomly selected from one batch.
b) Type tests are made to assess the basic characteristics of the detectors or dosemeters and are often assured by recognized national laboratories, while quality tests are usually done by dosimetry services that intend to use dosemeters for routine neutron personal dosimetry.
c) The performance requirements are listed in Tables 6.1 to 6.5 as type tests (TT) or quality tests (QT).
d) The number of dosemeters used in each test shall be such to demonstrate that the requirements are met at the 95 % confidence level.
e) The reader used in the evaluation of the detectors and dosemeters shall be subjected to routine tests to establish consistency of operation.
Information on the characteristics of detectors and dosemeters is given in Annex E.
8 Identification and accompanying documentation
8.1 Individual marking
Dosemeters and detectors shall have simple, unique and secure means of identification. The marking shall not impair the useful portion of the detector either directly or indirectly, nor shall it change its behaviour in any significant manner. Dosemeters shall carry any necessary markings for determining their origin, expiry date, if relevant, and that they are intended for neutron dosimetry.
8.2 Collective marking
The following information shall be indicate on each box (or other collective packing) of detectors or dosemeters or, failing this, on an accompanying note:
name or trademark of the manufacturer;
— complete designation;
— series number or manufacturer’s batch number;
— expiry date, if relevant.ISO 21909 pdf download.