Efficieny Calibration Curve
From mn/safe/nukwik
Revision as of 15:14, 28 June 2012 by Henrino@uio.no (talk | contribs)
Return to main
Make an efficiency calibration curve, where the counting efficiency is given as a function of γ energy. In table 1 the measured nuclei is listed with γ energy, number of counts, uncertainty in the number of counts and the counting time. The measurements was performed 27th March 2003.
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.
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 |