CEN - EN ISO 19361
Measurement of radioactivity - Determination of beta emitters activities - Test method using liquid scintillation counting
Organization: | CEN |
Publication Date: | 1 February 2020 |
Status: | active |
Page Count: | 30 |
ICS Code (Radiation measurements): | 17.240 |
scope:
This document applies to liquid scintillation counters and requires the preparation of a scintillation source obtained by mixing the test sample and a scintillation cocktail. The test sample can be liquid (aqueous or organic), or solid (particles or filter or planchet).
This document describes the conditions for measuring the activity of beta emitter radionuclides by liquid scintillation counting[14][15].
The choice of the test method using liquid scintillation counting involves the consideration of the potential presence of other beta emitter radionuclides in the test sample. In this case, a specific sample treatment by separation or extraction is implemented to isolate the radionuclide of interest in order to avoid any interference with other beta-, alpha- and gamma-emitting radionuclides during the counting phase.
This document is applicable to all types of liquid samples having an activity concentration ranging from a few Bq·l−1 to 106 Bq·l−1. For a liquid test sample, it is possible to dilute liquid test samples in order to obtain a solution having an activity compatible with the measuring instrument. For solid samples, the activity of the prepared scintillation source shall be compatible with the measuring instrument.
The measurement range is related to the test method used: nature of test portion, preparation of the scintillator - test portion mixture, measuring assembly as well as to the presence of the co-existing activities due to interfering radionuclides.
Test portion preparations (such as distillation for 3H measurement, or benzene synthesis for 14C measurement, etc.) are outside the scope of this document and are described in specific test methods using liquid scintillation[2][3][4][5][6][7][8
[2] ISO 9698, Water quality - Determination of tritium activity concentration - Liquid scintillation counting method
[3] ISO 11704, Water quality - Measurement of gross alpha and beta activity concentration in nonsaline water - Liquid scintillation counting method
[4] ISO 13162, Water quality - Determination of carbon 14 activity - Liquid scintillation counting method
[5] ISO 13164‑4, Water quality - Radon-222 - Part 4: Test method using two-phase liquid scintillation counting
[6] ISO 13165‑1, Water quality - Radium-226 - Part 1: Test method using liquid scintillation counting
[7] ISO 13168, Water quality - Simultaneous determination of tritium and carbon 14 activities - Test method using liquid scintillation counting
[8] ISO 18589‑5, Measurement of radioactivity in the environment - Soil - Part 5: Measurement of strontium 90
[9] NF M60‑338, Mesurage de l'activité Bêta dans les effluents et déchets par scintillation liquide
[14] Cassette p., Mesures de radioactivité par scintillation liquide, Techniques de l'Ingénieur, 2004, P2 552, 1-19
[15] Liquid Scintillation International, address