IEC 61976 pdf download

IEC 61976 pdf download Nuclear instrumentation – Spectrometry – Characterization of the spectrum background in HPGe gamma-ray spectrometry
1 scope and object
This International Standard applies to gamma-ray spectra collected with hyperpure germaniumdetectors (HPGe) for use in gamma-ray spectrometry, especially for low-background detectorsand measurements.This standard defines terms used to describe the background and thebackground spectrum itself.This standard does not present methods that describe how toreduce the background.
The object of this standard is to provide a uniform method for describing and characterizing thebackground in a spectrum from an HPGe detector. Definitions and methods are applied todefine values for an HPGe detector that is considered to be used for low-backgroundmeasurements. This approach provides both manufacturers and end users with a way tospecify the low-background performance of the detector and allows the comparison ofdetectors used for these kinds of measurements.
The background and peak values determined by the procedures in this standard will providethe user with information regarding the expected background performance of the detector, inparticular to allow for the comparison of several different detectors.
2Normative references
The following normative documents contain provisions which，through reference in this text,constitute provisions of this International Standard. For dated references,subsequentamendments to，or revisions of， any of these publications do not apply.However,parties toagreements based on this International Standard are encouraged to investigate the possibilityof applying the most recent editions of the normative documents indicated below.For undatedreferences, the latest edition of the normative document referred to applies. Members of lECand lso maintain registers of currently valid lnternational Standards.
IEC 60050(393):1996,International Electrotechnical Vocabulary (IEV) – Chapter 393:Nuclearinstrumentation: Physical phenomena and basic concepts
IEC 60050(394):1995,International Electrotechnical Vocabulary (IEV) – Chapter 394: Nuclearinstrumentation: Instruments
Definitions
For the purpose of this International Standard, the following definitions apply:
3.1
spectrum (of an ionizing radiation)
distribution of the values of a specific radiation quantity，usually associated with energy[IEV 393-04-29]
3.2
full width at half maximum (FWHM)
in a distribution curve comprising a single peak, the distance between the abscissa of two points on the curve whose ordinates are half of the maximum ordinate of the peak
[IEV 394-1 9-45]
3.3
sample
material whose radionuclide content is of interest and is to be measured
3.4
external background
spectrum from the HPGe detector in a given configuration without a sample to be measured
3.5
sample-induced background
all spectral data due to emissions from the sample that are not in the full-energy peak from any source of emissions placed close to the detector
NOTE This term is presented for explanation and is not used in this standard.
3.6
total background
sum of the external background and sample-induced background
NOTE This term is presented for explanation and is not used in this standard.
3.7
background peak
any full-energy peak from any source in the external background spectrum
3.8
background continuum
any data that does not belong to a full-energy peak in the external background spectrum
3.9
peak baseline
those counts in the peak region from both the sample-induced background and external background that are not due to a full energy peak