Gamma ray spectrometry

Thermal neutron activation was selected for the radioassay via the soTi(n,7)s 1 Ti reaction. Since the half-life of 51Ti was 5.8 min, nondestructive NAA by gamma-ray spectrometry was used in lieu of chem sepn of Ti... [Pg.365]

Zeisler R (2000b) Maintaining accuracy in gamma-ray spectrometry at high count rates. J Radio-anal Nucl Chem 244 507-510. [Pg.153]

In a different example, traceability in the amount-of-substance analysis of natural potassium, thorium, and uranium by the method of passive gamma-ray spectrometry was demonstrated by Nir-El (1997). For an absolute quantitative determination, accurate values of two parameters were required (i) the emission probability of a gamma-ray in the decay of the respective indicator radionuclides, and (2) the detection efficiency of that gamma-ray. This work employed a number of CRMs in the critical calibration of the detection efficiency of the gamma-ray spectrometer and the establishment of precise emission probabilities. The latter results compared well with literature values and provided smaller uncertainties for several gamma-rays that were critical for the traceabUity claim. The amount-of-substance analytical results of the long lived naturally occurring radionucHdes K, Th, and... [Pg.251]

Nir-El Y (1997) Traceability in the amount-of-substance analysis of natural potassium, thorium and uranium by the method of passive gamma-ray spectrometry. Accred Qual Assur 2 193-198. [Pg.254]

Urine None Gamma-ray spectrometry (phoswich detector) 0.08 nCi/200 cm3 No data Ide et al. 1985... [Pg.200]

Whole organs and tissues Animal placed, backbone down in lucite box and positioned 33 cm from Nal(TI) crystal. Livers and other tissues were counted between two Nal(TI) crystals. Gamma-ray spectrometry No data No data Lloyd et al. 1970... [Pg.202]

Analytical methods for quantifying americium in environmental samples are summarized in Table 7-2. The methods that are commonly used in the analysis of americium based on activity are gross a analysis, a-spectrometry and gamma-ray spectrometry. MS detection techniques are used to measure the mass of americium in environmental samples. (The mass-activity conversion factor for 241Am is 0.29 (lCi/ lg or 3.43 ig/ p,Ci [Harvey etal. 1993]). [Pg.207]

Perkins [18] carried out radium and radiobarium measurements in seawater by sorption and direct multidimensional gamma-ray spectrometry. The procedure described includes the removal of radium and barium from water samples on sorption beds of barium sulfate impregnated alumina (0.5-1 cm thick) and direct counting of these beds on a multidimensional y-ray spectrometer. The radioisotopes can be removed at Unear flow rates of sample of up to 1 m/min. [Pg.346]

Asaro, F., Applied Gamma-Ray Spectrometry and Neutron Activation Analysis, Proceedings of the XX. Colloquium Spec-troscopicum Internationale and 7. International Conference on Atomic Spectroscopy Praha 1977 Invited Lectures II, 413-426. [Pg.405]

Damiaan de Soete, " Gamma Ray Spectrometry , Brussels, Paleis der Academien (1967)... [Pg.655]

CONCENTRATION IN PPM EXCEPT AS NOTED () INDICATES INFORMATIONAL VALUE OBTAINED BY MULTIDIMENSIONAL GAMMA-RAY SPECTROMETRY... [Pg.139]

The use of radioactivated discs of aluminum and steel to estimate fragment erosion in solid targets at very high velocities was found to be feasible. Activation of discs was accomplished by slow neutron irradiation in a nuclear reactor at a flux of 8 x 1012 neutrons per cm2 per sec for 3 days for the aluminum discs (4g, 2.5cm diam x 0.3cm thick), and for 4 hrs for the steel discs (5g, 2.5cm diam x 0.15cm thick). Gamma-ray spectrometry indicated the presence of 59Fe (half-life 46 days) and 51Cr (half-life 28 days) in ratios 0.5 for aluminum and 1.3 for steel. The radioactivities in the aluminum arose solely from impurities, whereas in the steel they were contributed by the major component, iron, and only supplemented by the chromium impurity. The radioactivity was found by successive acid soln determinations to be distributed evenly in both metals... [Pg.134]

Keywords Gamma-ray spectrometry Pulser method Uncertainty Traceability... [Pg.230]

As test laboratories, gamma-ray spectrometry laboratories are usually engaged in determination of the activities of gamma-ray emitters in samples. In order to determine the activity present in a sample, beside the counting efficiency, the emission probability and the peak ar-... [Pg.230]

Traceability of measurement results of the effective acquisition time in gamma-ray spectrometry implemented by the pulser method 231... [Pg.231]

The recent general availability of solid state Ge(Li) gamma-ray detectors has made possible new applications of activation analysis to multielement trace analysis. A simplified schematic representation of a Ge(Li) detector is given in Fig. 6. The principal advantage of these detectors is their excellent energy resolution for gamma-ray spectrometry 52>. While a typical 3 X 3" NaI(Tl) scintillation crystal may have a photopeak resolution of 50 KeV fwhm (/ull width at Aalf maximum) for the 137Cs... [Pg.65]

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