BS ISO 7503-2:2016 pdf free.Measurement of radioactivity – Measurement and evaluation of surface contamination Part 2: Test method using wipe-test samples.
Iso 7503 (all parts) and ISO 8769 are addressed to the people responsible for measuring the radioactivity present on solid surfaces.
This part of ISO 7503 applies to the evaluation of contamination on surfaces in terms of activity per unit area by an indirect method of measurement.
This part of ISO 7503 is applicable to well-defined surfaces, such as those of equipment and facilities, containers of radioactive materials, sealed sources and buildings or land.
This part of ISO 7503 can be used for laboratory and equipment/installation control and for remediation and monitoring activities to comply with release criteria.
This part of ISO 7503 also refers to institutions/authorities controlling nuclear material transports or material/equipment clearance according to national legislation guideline values or international convention limits.
This part of ISO 7503 does not apply to contamination of the skin, clothing or loose material, such as gravel.
NOTE Direct evaluation of surface contamination from alpha-emitters, beta-emitters and photon emitters is dealt with in ISO 7503-1. The calibration of instruments for the evaluation of radioactive surface contaminations is dealt with in ISO 7503-3.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 8769, Reference sources — Calibration of surface contamination monitors — Alpha-, beta- and photon emitters
ISO 9698, Water quality — Determination of tritium activity concentration — Liquid scintillation counting method
ISO 11929, Determination of the characteristic limits (decision threshold, detection limit and limits of the confidence interval) for measurements of ionizing radiation — Fundamentals and application
ISO 18589-2, Measurement of radioactivity in the environment — Soil — Part 2: Guidance for the selection of the sampling strategy, sampling and pre-treatment of samples
ISO/IEC 17025, General requirements br the competence of testing and calibration laboratories
IEC 60325, Radiation protection instrumentation — Alpha, beta and alpha/beta (beta energy >60 keV) contamination meters and monitors
3 Terms and definitions, symbols and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions and those given in Iso 7503-1 apply.
3.1.1 removable surface contamination radioactive material that can be removed from surfaces by non-destructive means, Including casual contact, wiping, or washing
Note I to entry: it should be noted that under the influence of moisture, chemicals, etc., or as a result of corrosion or diffusion, fixed contamination may become removable or vice versa without any human action. Furthermore, surface contaminations may decrease due to evaporation and volatilization.
Note 2 to entry: It should be emphasized that the ratio between fixed and removable contamination can vary over time, and that some decisions, such as those related to clearance, should be based on total activity with the potential to become removable overtime, not just the amount that Is removable at the time of a survey.
3.1.2 wipe test test to determine if removable contamination is present through wiping the surface with a dry or wet material, followed by evaluation of the wipe material for removable contamination
Note ito entry: The type of wipe test, wet or dry, needs to be assessed by a competent person. In some Instances (e.g. tritium contamination) a wet wipe may be preferred. In others, it may be more practical or advisable to use a dry wipe.
3.1.3 wiping efficiency ratio of the activity of the radionuclides removed from the surface by one wipe sample to the activity of the radionuclides of the removable surface contamination prior to this sampling.BS ISO 7503-2 pdf download.
Tags: Measurement of radioactivity
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