Gamma spectra

Table 2 illustrates the above stipulated diffemce of gamma spectra. 

Figure 5. Comparison of gamma spectra from cloud, ground-filter, and fallout samples at thirteen days after the event, and of unfractionated U2S5C2 eleven days after irradiation...

Ralston, H. R., and G. E. Wilcox A Computer Method of Peak Area Determination from Ge(Li) Gamma Spectra. The 1968 International Conference Modem Trends in Activation Analysis, Gaithersburg, Maryland, October 7—11, 1968, Paper 37. 

Figure 9. Gamma spectra recorded by deep-diving vehicle in November 2003 when surveying marine environment around the sunken submarine K-159)...

All the programs for analysis of gamma spectra measured with germanium detectors generally allow the following steps (among others) to be carried out ... 

Baeza, A., Corvo, G., delRio, M., Miro, C. and Paniagua, J,M., A program ESPEC for the analysis of gamma spectra of environmental samples. Appl. Radiat. Isot., 43 (1992) 833-839. 

For the analysis of complex gamma spectra, it is helpful to have an analytic function that represents the efficiency of the detector as a function of energy. Many semiempirical equations have been developed to fit the efficiency of Ge(Li) detectors."" " TTiree examples are given here. 

Despite the superb energy resolution of Ge detectors compared to that of NaI(Tl) scintillators (see Fig. 12.32), analysis of complex gamma spectra is... 

The large amount of data generated with Ge(Li) or HP-Ge radiation detector systems makes it very useful to have a computer for information processing. The equipment can be programmed to compare the areas of specified peaks in the spectra of samples and standards and, thus, to calculate the elemental levels. For additional information, the reader is referred to publications focusing on analysis of gamma spectra and reduction of data (Harpers, 1986 Op de Beeck and Hoste, 1976 Perlman, 1981 and Yule, 1981). 

The interpretation of gamma spectra is sometimes difficult due to the interaction of gamma radiation... 

For analytical purposes particularly in the analysis of complex gamma spectra having many closely spaced peaks semiconductor detectors are used. They have excellent resolution but lower efficiency because of their lower atomic number. In addition, the volume of available semiconductor detectors is usually much smaller compared to sodium iodide detectors. Both of these limits result in much lower detection efficiency. 

Gamma spectra are of great help for qualitative and quantitative analysis of radioactive samples of unknown composition. 

The complexity of prompt gamma spectra depends on the nuclear level structure of the emitting nuclide. There are two major types of spectra ... 

Typical shapes of prompt gamma spectra for the lightest (type 1) and the heaviest nuclides (type 2)... 

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