Ämnesområden: Specialavfall; Strålningsskydd
Kommittébeteckning: SIS/TK 405 (Kärnenergi)
Källa: ISO
Svarsdatum: den 3 mar 2020
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This document focuses on monitoring the activity concentrations of radioactive gases, from which the activity released are calculated, in the gaseous effluent discharge from facilities producing positron emitting radionuclides and radiopharmaceuticals. Such facilities produce short half-life radionuclides used for medical purposes or research and may release gases typically including, but not limited to 18F, 11C, 15O, 13N. These facilities include accelerators, radiopharmacies, hospitals and universities. This document provides performance-based criteria for the design and use of air monitoring equipment including probes, transport lines, sample monitoring instruments, and gas flow measuring methods. This document also provides information covering monitoring program objectives, quality assurance, developing air monitoring control action levels, system optimisation, and system performance verification.

The goal of achieving an unbiased measurement is accomplished either by direct (in-line) measurement on the exhaust stream or with samples which are extracted (bypass) from the exhaust stream, in which the radioactive gases are well mixed in the airstream. This document sets forth performance criteria and recommendations to assist in obtaining valid measurements.

The criteria and recommendations of this document are aimed at monitoring which is conducted for regulatory compliance and system control. If existing air monitoring systems were not designed to the performance criteria and recommendations of this document, an evaluation of the performance of the system is advised. If deficiencies are discovered, it should be determined if retrofit is needed and practicable.

The criteria and recommendations of this document apply under both normal and off-normal operating conditions, provided that normal and off-normal conditions do not include production of aerosols or vapours. If the normal and/or off-normal conditions produce aerosols and vapours, then the aerosol collection principles of ISO 2889 also apply.