Norm

ISO/DIS 19581:2016 en

Measurement of radioactivity - Gamma emitting radionuclides - Rapid test method using NaI(Tl) gamma-ray spectrometry

  • Deze norm is niet direct leverbaar vanuit de NEN-shop.
    Wilt u dit product bestellen neemt u dan contact op met NEN-klantenservice: (015) 2 690 391 of klantenservice@nen.nl

Over deze norm

Status Ontwerp
Aantal pagina's 17
Commissie Radioactiviteit - Toepassing en meten
Gepubliceerd op 01-05-2016
Taal Engels
This International Standard describes a screening test method to quantify rapidly the activity concentration of gamma-emitting radionuclides, such as 131I,132Te ,134Cs and 137Cs, in solid or liquid test samples using gammaray spectrometry with low resolution NaI(Tl) or LaBr3(Ce) detectors (see IEC 61563). This test method can be used for the measurement of any potentially contaminated environmental matrices (including soil), food and feed samples as well as industrial materials or products that have been properly conditioned. Sample preparation techniques used in the screening method are not specified in this standard, since special sample preparation techniques other than simple machining (cutting. grinding, etc.) should not be required. Although the sampling procedure is of utmost importance in the case of the measurement of radioactivity in samples, it is out of scope of this international standard; other international standards for sampling procedures that may be used in combination with this standard are available ([7],[8],[9],[10],[11],[12]). The test method applies to the measurement of gamma-emitting radionuclides such as 40K, 131I, 134Cs and 137Cs. Using sample sizes of 0,5 l to 1,0 l in a Marinelli beaker and a count time of 5 min to 20 min, activity concentrations of 50 Bq/kg can be determined using a typical NaI(Tl) spectrometer (7% typical resolution (FWHM) at 662 keV). This test method also can be performed in a “makeshift” laboratory or even outside a testing laboratory on samples directly measured in the field where they were collected. During a nuclear or radiological emergency, this test method enables a rapid measurement ofthe sample activity concentration of potentially contaminated samples to check against operational intervention levels (OILs) set up by decision makers that would trigger a predetermined emergency response to reduce existing radiation risks [2]. Due to the uncertainty associated with the results obtained with this test method, test samples requiring more accurate measurements can be measured using HP(Ge) gamma-ray spectrometry in a testing laboratory, following appropriate preparation of the test samples [13], [14]. This standard does not contain criteria to establish the activity concentration of OILs.

Details

ICS-code 17.240
Nederlandse titel Measurement of radioactivity - Gamma emitting radionuclides - Rapid test method using NaI(Tl) gamma-ray spectrometry
Engelse titel Measurement of radioactivity - Gamma emitting radionuclides - Rapid test method using NaI(Tl) gamma-ray spectrometry

Winkelwagen

Subtotaal:

Ga naar winkelwagen