Gamma-ray Spectroscopy with LaBr3:Ce Scintillator ... - MPG HLL
Gamma-ray Spectroscopy with LaBr3:Ce Scintillator ... - MPG HLL
Gamma-ray Spectroscopy with LaBr3:Ce Scintillator ... - MPG HLL
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Fig. 8. Spectrum of a 137 Cs source, measured at room temperature (23°C). In the left side of the figure, the same spectrum is shown in two different vertical<br />
scales to better show both 32keV X-<strong>ray</strong> lines and 662keV line. The escape peak of the 661.7 KeV line (shown in the expanded region on the right side of the<br />
figure) is clearly distinguishable and the noise threshold is well below the 32 KeV X-<strong>ray</strong> line.<br />
2000<br />
57<br />
Co spectrum<br />
122 keV<br />
Counts<br />
1500<br />
1000<br />
6.1%<br />
FWHM<br />
500<br />
0<br />
14 keV<br />
Escape<br />
136.4 keV<br />
0 40 80 120 160<br />
Energy [keV]<br />
Fig. 9. Spectrum of a 57 Co source, measured at room temperature (23°C). The 14 KeV line is clearly distinguished from noise. Laescape<br />
peak is visible in figure.<br />
2000<br />
57<br />
Co spectrum<br />
122 keV<br />
Counts<br />
1500<br />
1000<br />
5.7%<br />
FWHM<br />
500<br />
0<br />
14 keV<br />
Escape<br />
136.4 keV<br />
0 40 80 120 160<br />
Energy [keV]<br />
Fig. 10. Same measurements of Fig. 8, but made at a lower temperature, in order to reduce the electronic noise contribution. The energy<br />
resolution has improved to 5.7%.
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