The possibilities of the direct measurement of the activity of weak beta-emitter isotopes (C- 14, S- 35) in aqueous solution have been studied. Detectors were to be found, with which sulfite ions or free sulfurous acid do not interfere-one of them was a polyethylene tube bent helically, and filled with anthracene powder, the other a plastic scintillator capillary, also wound spirally. The advantages of the first type are its high sensitivity (20 to 40% efficiency), the ease of preparing it in any laboratory and the fact that its use does not require any special auxiliaryquipment. Though of considerably lower efficiency (5 to 10%), the second type, owing to its reliability and easy handling, can be used more generally, but it is mpre exacting as concerns apparatus. Both of the detectors can be used either for the determination of the activity of single samples, or for radiochromatogram recording.
|Number of pages||12|
|Journal||Periodica Polytechnica Chemical Engineering|
|Publication status||Published - Jan 1 1969|
ASJC Scopus subject areas
- Chemical Engineering(all)