Thermoluminescence dosimetry systems for personal and environmental monitoring
|Publication Date:||1 June 2006|
|ICS Code (Radiation protection):||13.280|
Scope and object
This International Standard applies to thermoluminescence dosimetry (TLD) systems that are used for measuring the personal dose equivalents Hp(10) or Hp(0,07) or the ambient dose equivalent H*(10) for external photon or beta radiation within the dose range from 0,01 mSv to 10 Sv. Different energy ranges are specified for different operational quantities and radiation types, as evident in the following Table. All the energy values given are mean energies with respect to the prevailing dose quantity.
NOTE 1 In this standard, "dose" means personal or ambient dose equivalent, unless otherwise stated.
NOTE 2 For Hp(10) and H*(10) no beta radiation is considered as no conversion coefficients are available, neither in ICRU 56, ICRU 57 nor in ISO 6980.
This standard is intended to be applied to thermoluminescence dosimetry (TLD) systems that are capable of evaluating doses from readings in the required unit (Sv). The only correction that may be applied is the one resulting from natural background radiation using extra dosemeters.
NOTE 3 The correction due to natural background may be made before or after the dose calculation.
In this standard, requirements are stated, as a minimum, for fixed ranges of influence quantities, for example 80 keV to 1,25 MeV for photon energy (see Tables 3 to 5). A dosimetry system shall fulfil the requirements stated for these minimal ranges. However, the manufacturer may state larger ranges for the different influence quantities, for example 60 keV to 7 MeV. These larger ranges are called rated ranges. In such cases, the dosimetry systems must fulfil the requirements stated for these rated ranges. Thus, dosimetry systems can be classified by stating a set of ranges (for dose, energy, temperature, etc.) within which the requirements stated in this standard are met.
For the dosimetry systems described above, this standard specifies general characteristics, general test procedures and performance requirements, radiation characteristics as well as environmental, electrical, mechanical, software and safety characteristics.
The absolute calibration of the dosimetry system is not checked during a type test according to this standard as only system properties are of interest. The absolute calibration is checked during a routine test.
This standard does not incorporate requirements for neutron dosemeters nor does it cover the handling of the resulting data.