Se170063 Thin Window Analysis

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In order to try to pin down the ratio of pure selenium to the selenium in the soil, try using a 2 channel window to find the signal. The error in the signal will be found by standard error propagation in mathematica. Since the max value is fixed, it does not appear in the stats box, but I have included it in the table.


400 <t< 640 sec 1100 < t < 1360 sec 1875 < t < 2150 2650 < t < 2930 sec 3400 < t < 3690 sec 4120 < t < 4400 sec 4840 < t < 5130 sec
Thin Window 170063 PureSe ThinWindow 400 640Sec.png 170063 PureSe 1100 1360Sec ThinWindow.png 170063 PureSeSpec 1875 2150Sec ThinWindow.png 170063 PureSeSpec 2650 2930Sec ThinWindow.png 170063 PureSeSpec 3400 3690Sec ThinWindow.png 170063 PureSeSpec 4120 4400Sec ThinWindow.png 170063 PureSeSpec 4840 5130Sec ThinWindow.png
Original Window 170063 PureSe 400 640Sec OGWindow.png 170063 PureSe 1100 1360 Seconds OGWindow.png 170063 PureSeSpec 1875 2150Sec OGWindow.png 170063 PureSeSpec 2650 2930Sec OGWindow.png 170063 PureSeSpec 3400 3690Sec OGWindow.png 170063 PureSeSpec 4120 4400Sec OGWindow.png 170063 PureSeSpec 4840 5130 OGWindow.png
Expanded Window 170063 PureSe 400 640Sec ExpWindow.png 170063 PureSeSpectrum 1100 1360Sec ExpWindow.png 170063 PureSeSpec 1875 2150 ExpWindow.png 170063 PureSeSpec 2650 2930Sec ExpWindow.png 170063 PureSeSpec 3400 3690Sec ExpWindow.png 170063 PureSeSpec 4120 4400Sec ExpWindow.png 170063 PureSeSpec 4840 5130Sec ExpWindow.png
Maximum of Histogram 260980 241756 220348 191476 165549 139528 130930
Original Background 10560 +/- 51.58 10560 +/- 51.41 9496 +/- 48.9 8898 +/- 47.1 9418 +/- 48.2 7485 +/- 43 7032 +/- 31.1
Expanded Background 10750 +/- 42.42 10630 +/- 42.09 9674 +/- 40.2 9029 +/- 38.7 9248 +/- 39.1 7634 +/- 35.5 7161 +/- 34.2
Signal Background (Take Larger Error) 10560 +/- 51.58 10560 +/- 51.41 9496 +/- 48.9 8898 +/- 47.1 9418 +/- 48.2 7485 +/- 43 7161 +/- 34.2
Integrated Background 21120 +/- 103.16 21120 +/- 102.82 18992 +/- 97.8 17796 +/- 94.2 18836 +/- 96.4 14970 +/- 86 14322 +/- 68.4
Signal in Thin Window 466700 +/- 100285 444100 +/- 107395 412800 +/- 105416 356800 +/- 90173 304100 +/- 70249 258700 +/- 63183 233500 +/- 52406
Background Subtracted Signal 445580 +/- 100285.01 422980 +/- 107395.05 393808 +/- 105416.05 339004 +/- 90173.05 285264 +/- 70249.07 243730 +/- 63183.06 219178 +/- 52406.04
Time Correction Factor (Sec) 400 370 395 400 350 345 360
Corrected Counts 483015.53 +/- 108710.48 455750 +/- 115715.63 426463.63 +/- 114157.43 367485.52 +/- 97748.96 306127.92 +/- 75387.02 261292.55 +/- 67735.87 235683.31 +/- 56352.50
.dat file entry 7.607165162 +/- 0.225066221 7.469018062 +/- 0.2539001646 7.346511269 +/- 0.2676838585 7.179649592 +/- 0.2659940452 6.96187741 +/- 0.2462598642 6.838606337 +/- 0.2592338358 6.700363353 +/- 0.2391026331

Below is the table for the Se-Ash Mixture


0 <t< 300 sec 730 < t < 1020 sec 1480 < t < 1775 2250 < t < 2550 sec 3050< t < 3300 sec 3775 < t < 4050 sec 4480 < t < 4770 sec
Thin Window 170063 MixSpec 0 300Sec ThinWindow.png 170063 MixSpec 730 1020Sec ThinWindow.png 170063 MixSpec 1480 1775Sec ThinWindow.png 170063 MixSpec 2250 2550Sec ThinWindow.png 170063 MixSpec 3050 3300Sec ThinWindow.png 170063 MixSpec 3775 4050Sec ThinWindow.png 170063 MixSpec 4480 4770Sec ThinWindow.png
Original Window 170063 MixSpec 0 300 OGWindow.png 170063 MixSpec 730 1020Sec OGWindow.png 170063 MixSpec 1480 1775Sec OGWindow.png 170063 MixSpec 2250 2550Sec OGWindow.png 170063 MixSpec 3050 3300Sec OGWindow.png 170063 MixSpec 3775 4050Sec OGWindow.png 170063 MixSpec 4480 4770Sec OGWindow.png
Expanded Window 170063 MixSpec 0 300Sec ExpWindow.png 170063 MixSpec 730 1020Sec ExpWindow.png 170063 MixSpec 1480 1775Sec ExpWindow.png 170063 MixSpec 2250 2550Sec ExpWindow.png 170063 MixSpec 3050 3300Sec ExpWindow.png 170063 MixSpec 3775 4050Sec ExpWindow.png 170063 MixSpec 4480 4770Sec ExpWindow.png
Maximum of Histogram 173289 155770 135740 124656 88582 80993 77781
Original Background 29440 +/- 84.93 20580 +/- 70.31 16420 +/- 62.52 14460 +/- 58.47 10950 +/- 50.65 10530 +/- 49.90 9809 +/- 48.2
Expanded Background 28960 +/- 69.12 20580 +/- 57.79 16500 +/- 51.60 14500 +/- 48.2 10630 +/- 41.29 10460 +/- 41.01 9814 +/- 39.7
Signal Background (Take Larger Error) 29440 +/- 84.93 20580 +/- 70.31 16420 +/- 62.52 14460 +/- 58.47 10950 +/- 50.65 10530 +/- 49.90 9809 +/- 48.2
Integrated Background 58880 +/- 169.86 41160 +/- 140.62 32840 +/- 131.04 28920 +/- 116.94 21900 +/- 101.3 21060 +/- 99.8 19618 +/- 96.4
Signal in Thin Window 342200 +/- 93025 300100 +/- 78768 267200 +/- 74554 238600 +/- 63777 170100 +/- 46436 153200 +/- 39780 147900 +/- 38766
Background Subtracted Signal 283320 +/- 93025.16 258940 +/- 78768.13 234360 +/- 74554.12 209680 +/- 63777.11 148200 +/- 46436.11 132140 +/- 39780.13 128282 +/- 37866.12
.dat file entry 6.850549805 +/- 0.3283395454 6.794470731 +/- 0.3041945238 6.677638317 +/- 0.3181179382 6.549555363 +/- 0.3041640118 6.384857074 +/- 0.3133340756 6.174846148 +/- 0.3010453307 6.092105322 +/- 0.2951787468


Below is a plot of the ratio of the activities where the pure selenium sample has been time corrected back to match the run time of the mixture.

170063 MixVsPureRatio ThinWindowMethod.png

Note that this does give the expected result that the ratio between the two samples is statistically the same as 0.5, which is the ratio of the masses. The only problem here is that the error is quite large, The average of the uncertainty divided by the mean is 39.6%.

Below are the half life plots for the Pure Selenium sample and the ash mixture


170063 MixHLPlot ThinWindowMethod.png

170063 PureSeHLPlot ThinWindowMethod.png


The slope of the mixture plot gives a half life of 63.48 +/- 26.85 minutes. This does overlap, but the error is extremely large.

The slope of the pure selenium sample plot gives a half life of 56.08 +/- 16.33 minutes. Again this does overlap, but the error is still quite large.

The ratio of the initial activities is 0.49 +/- 0.13. Now this does fall within 1 standard deviation of 0.5, which is the value we want.

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