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ABSOLUTE STANDARDIZATION WITH A NaI(Tl) CRYSTAL. I. CALIBRATION BY MEANS OF A SINGLE NUCLIDE
Abstract The absolute standardization of radioisotopes, emitting two γ-rays in coincidence, is possible by means of a NaI(Tl) crystal spectrometer. For the absolute activity (N) of such aExpand
Natural radioactivity of K-40, Rb-87 and Lu-176
The radioactive isotopes 40K and 87Rb were calibrated by 4πβ liquid scintillation counting. 176Lu was calibrated by β—γ coincidence counting, by means of a calibrated NaI crystal and by the “sumExpand
Concentration of uranium in sea fish.
A concentration factor for uranium between fish and sea water was established. Uranium was determined by uv fluorescence in ash with NaF + 2% LiF. Commercially obtained fish from Amsterdam were usedExpand
Specific gamma emission of natural potassium and lanthanum
Abstract New measurements are reported for the specific gamma activities of natural potasium -3.25 γ s·gK — and of natural lanthanum -0.301 (0.81 MeV) γ s·g La and 0.513 (1.43 MeV) γ s·g La. TheExpand
The Chemistry of Astatine
Publisher Summary This chapter highlights the chemical study of astatine. Astatine, as the heaviest member of the family of halogens, forms a number of compounds in which the element has differentExpand
Absolute standardization with a NaI(Tl) crystal—III: Calibration of β+-emitters
ABS>The absolute standardization ot BETA -emitters, emitting one gamma ray, is possible with a NaI(Tl) crystal. No corrections for angular correlations are required if the absolute activity, N, isExpand
Absolute standardization with
Abstract In two previous papers(1,2) we described a method to calibrate radioisotopes, which emit two or more γ-rays in coincidence, using the expression: N = A 1 A 2 A 12 + T. A1 and A2 are theExpand
Absolute standardization with a NaI(Tl) crystal-II determination of the total efficiency
The absolute standardization of radioisotopes emitting two γ-rays of about equal energy in coincidence (e.g. Sc46, Co60, pure β+-emitters) is possible with a NaI(Tl) well-type crystal, by measuringExpand
Absolute standardization with a NaI(Tl) crystal—IV Determination of the photoelectric efficiency
Abstract The absolute standardization of radioisotopes emitting two γ-rays incoincidence (e.g. Sc 46 , Co 60 and Na 24 ) is possible with a NaI(Tl) well-type crystal by measuring the count ratesExpand
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