Detailní informace o produktu

Typ produktu Česká technická norma (ČSN)
Oznaèení zákl. dokumentu ČSN EN ISO 10704
Zmìna/oprava/svazek
Tøídicí znak 757609
Katalogové èíslo 507911
Název dokumentu Kvalita vod - Měření celkové objemové aktivity alfa a celkové objemové aktivity beta - Metoda přímé depozice tenké vrstvy
Anglický název Water quality - Gross alpha and gross beta activity - Test method using thin source deposit
Datum vydání 01.10.2019
Datum ukonèení platnosti
Datum úèinnosti 01.11.2019
Vìstník vydání (mìs/rok) 10/19
Vìstník zrušení
Zpùsob vydání ve věstníku
Zpùsob pøevzetí originálu vyhlášením
Bude pøeložena Ne
Použité jazyky
ICS kódy 13.060.60 - Zkoušení fyzikálních vlastností vody
13.280 - Radiační ochrana
Subsektor
Deskriptory
Klíèová slova
Harmonizace/Urèení Informace o harmonizovaných a urèených normách jsou zveøejnìny v Databázi harmonizovaných norem
Zapracované dokumenty
OznaèeníRok vydání
EN ISO 107042019
Zmìny
Opravy
Nahrazuje dokumenty
Katalogové èísloOznaèeníRok vydání
98823ČSN EN ISO 10704 2016
Byla nahrazena dokumenty
Anotace

ČSN EN ISO 10704 This document specifies a method for the determination of gross alpha and gross beta activity concentration for alpha- and beta-emitting radionuclides. Gross alpha and gross beta activity measurement is not intended to give an absolute determination of the activity concentration of all alpha and beta emitting radionuclides in a test sample, but is a screening analysis to ensure particular reference levels of specific alpha and beta emitters have not been exceeded. This type of determination is also known as gross alpha and gross beta index. Gross alpha and gross beta analysis is not expected to be as accurate nor as precise as specific radionuclide analysis after radiochemical separations. Maximum beta energies of approximately 0,1 MeV or higher are well measured. It is possible that low energy beta emitters can not detected (e.g. 3H, 55Fe, 241Pu) or can only be partially detected (e.g. 14C, 35S, 63Ni, 210Pb, 228Ra). The method covers non-volatile radionuclides, since some gaseous or volatile radionuclides (e.g. radon and radioiodine) can be lost during the source preparation. The method is applicable to test samples of drinking water, rainwater, surface and ground water as well as cooling water, industrial water, domestic and industrial wastewater after proper sampling, sample handling, and test sample preparation (filtration when necessary and taking into account the amount of dissolved material in the water). The method described in this document is applicable in the event of an emergency situation, because the results can be obtained in less than 1 h. Detection limits reached for gross alpha and gross beta are less than 10 Bq/l and 20 Bq/l respectively. The evaporation of 10 ml sample is carried out in 20 min followed by 10 min counting with window-proportional counters. It is the laboratory's responsibility to ensure the suitability of this test method for the water samples tested.