Difference between revisions of "Efficieny Calibration Curve"

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[[Gamma Spectroscopy Analysis]]  
 
[[Gamma Spectroscopy Analysis]]  
  
Make an efficiency calibration curve, where the counting efficiency is given as a function of ã energy. In table 1 the measured nuclei is listed with <span class="texhtml">γ</span>energy, number of counts, uncertainty in the number of counts and the counting time. The measurements was performed 27th March 2003.  
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Make an efficiency calibration curve, where the counting efficiency is given as a function of <math>\gamma</math> energy. In table 1 the measured nuclei is listed with <span class="texhtml">γ</span>energy, number of counts, uncertainty in the number of counts and the counting time. The measurements was performed 27th March 2003.  
  
 
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Revision as of 12:32, 28 June 2012

Gamma Spectroscopy Analysis

Make an efficiency calibration curve, where the counting efficiency is given as a function of [math]\gamma[/math] energy. In table 1 the measured nuclei is listed with γenergy, number of counts, uncertainty in the number of counts and the counting time. The measurements was performed 27th March 2003.

table 1 : measurment data from standard γ-calibartion sources, measured 6. oct 2006.
Nuclide
Energy (keV)
Counts
Uncerainty
Real Time (s)
137Cs
661.66
161681
432
210
133Ba
80.997
99426
408
380

276.398
13284
150
380

302.853
31734
202
380

356.017
92291
322
380

241am

59.54
407142
766
376
60Co
1173.237
14039
137
189

1332.501
12822
121
189
54Mn
834.84
317
26
1268.56
152Eu
121.78
486526
1031
1111

244.698
82174
519
1111
344.279 211766 625 1111
778.9 48601 396 1111
295.939 4076 245 1111
964.079 45298 359 1111
1408.006 47191 237 1111


A table of the γ intensities, Iγ, can be found Gamma-Energy Standards

To calculate the efficiency you need to know the amount of activity in the sources. Table 2 lists the amount of activity at the time of purchase. You must correct these number based upon the age and half life of the sources.

table 2: activety of standards
Nuclide: activety: Date
60Co 10.57 μCi 1. oct 1988
133Ba 6.09 μCi 1. oct 1988
54Mn 367 kBq 1. apr 1996
137Cs 11.5 μCi 1. oct 1988
241An 11.56 μCi 1. oct 1988
152Eu 3.71 μCi 1.apr 2004