標準號：ISO 10703-2007
中文標準名稱：水質.放射性核輻射活性濃度的測定.高分辨率γ光譜測定法
英文標準名稱：Water quality - Determination of the activity concentration of radionuclides - Method by high resolution gamma-ray spectrometry
標準類型：Z16
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：Z16
國際標準分類號：13.060.60;17.240
適用范圍：This International Standard specifies a method for the simultaneous determination of the activity concentrationof various radionuclides emitting gamma rays with energies 40 keV < E < 2 MeV in water samples, bygamma-ray spectrometry using germanium detectors with high energy resolution in combination with amultichannel analyser.NOTE The determination of the activity concentration of radionuclides emitting gamma rays with energy below40 keV and above 2 MeV is also possible within the scope of this International Standard, provided both the calibration ofthe measuring system and the shielding are adapted to this purpose.This International Standard includes the procedures for energy calibration, determination of the energydependent sensitivity of the measuring system, the analysis of the spectra and the determination of the activityconcentration of the various radionuclides in the sample studied. It is only applicable to homogeneoussamples. Samples with activities typically between 1 Bq and 104 Bq can be measured as such, i.e. withoutdilution or concentration of the sample or special (electronic) devices.Depending on different factors, such as the energy of the gamma rays and the emission probability pernuclear disintegration, the size and geometry of the sample and the detector, the shielding, the counting timeand other experimental parameters, the sample should be concentrated by evaporation when activities belowabout 1 Bq have to be measured. Also, when the activity is considerably higher than 104 Bq, the sampleshould be either diluted or an aliquot of the sample should be taken or the source to detector distance shouldbe increased, or a correction for pile-up effects should be applied.