radon primary standard source is very important in the field of radon measurments to calibtate devises and instruments
There isn't a an international primary standard source. I think that you can refer to the several papers that you can find on the web, for example you can find some information in the Saphimo Alphaguard e-book.
thanks for your answer but i know there is group in Germany in BTP lab and other in Romania and in USA but i ask about simple method
I agree with Giancarlo that there is no Standard Source for Radon. Most probably, they use Radium but I will check with BARC, DAE Mumbai how they calibrate Radon Sources.
i think there are to type of standard source of radon Primary and secondary as examples in NIST and BTP from Radium source (solid or solution) now we trying to develop new method from solid Radium source I search about new idea in this field?
First: What is a primary standard: See "International vocabulary of
metrology — Basic and general concepts and associated terms (VIM)" at BIPM website.
5.4 (6.4)
primary measurement standard
primary standard measurement standard established using a primary reference measurement procedure, or created as an artifact, chosen by convention
In case of Rn-222 you need a radon gas standard done by an absolute method. This would be for example
J.L. Picolo, Nucl. Instr. and Meth. A 369 (1996) 452
R. Dersch, Appl. Radiat. Isot. 60 (2004) 387
See also for further information: Dersch, R., 1998. Appl. Radiat. Isotopes, 49, pp.1171-1174.
PTB and METAS have implemented the absolute method.
Annette Röttger thanks for your help...... I already have all this paper i just make discutions for new information
You can use
1) 4pi beta gamma coincidence counters
2) Triple to double coincidence counters (TDCR)
Best radon source is a calibrated glass source where the included amount is known from a certain Laboratory (EPA etc.)
Second alternative is a powder source of a known calibrated initial activity, After a good initial calibration, the activity in a certain day is known and so on.
For measurement, high efficiency gamma detectors can be used. For example PET detectors, NaJ, High purity Ge detectros etc.
PIPS detectors for a-activity deposited in paper filters can be employed efficiently as well.
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