LB Thesis Outline - Revision history

Brenleyt: /* Abstract */

2018-05-30T21:07:19Z

Abstract

Brenleyt: /* Data/Error Analysis */

2018-03-08T20:43:11Z

Data/Error Analysis

Brenleyt: /* Split Run Measurement Technique */

2018-03-08T20:33:55Z

Split Run Measurement Technique

Brenleyt: /* Calibration Method */

2018-03-08T20:33:12Z

Calibration Method

Brenleyt: /* Appendices */

2018-03-06T17:43:09Z

Appendices

Brenleyt: /* Detector Efficiencies */

2018-03-06T17:42:28Z

Detector Efficiencies

Brenleyt: /* Detector Efficiencies */

2018-03-06T17:41:20Z

Detector Efficiencies

Brenleyt: /* Detector Efficiencies */

2018-03-06T17:41:13Z

Detector Efficiencies

Brenleyt: /* DAQ */

2018-03-06T17:40:20Z

DAQ

Brenleyt: /* Split Run Measurement Technique */

2018-03-06T17:39:06Z

Split Run Measurement Technique

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 =Abstract=
-Photon Activation Analysis functions as a way to quantify isotopic concentrations in a certain material. This information is very useful when trying to find potential contaminants within a sample. Selenium, when ingested in large amounts, is harmful as it is a toxic substance. When applying PAA, one of the most important pieces of the investigation is ensuring that isotopes within a sample are detectable i.e. how active does a sample have to be to detect the isotopes of interest? Soil was gathered and targets were created with 50%, 10%, 1%, and 0.1% concentration by mass of selenium which was introduced to the soil during the target creation. The targets were irradiated using the Linear Accelerator at the Idaho Accelerator Center with a beam energy of 32 MeV. Once active, the spectral data was gathered using a high purity germanium detector.
+     Photon Activation Analysis (PAA) is a technique used to measure nuclear isotopic concentrations by observing the characteristic gamma decay of a sample of interest post-irradiation. The photons used to irradiate a sample were produced by accelerating electrons to an energy of 32 MeV at the Idaho Accelerator Center and impinging those electrons onto a Tungsten/Aluminum converter to create Bremsstrahlung radiation. Four soil samples, with varying concentrations of Selenium by mass (50%, 10%, 1%, 0.1%), were irradiated. The purpose of the experiment was to determine the minimum concentration in which Se-81m and Se-75 can be accurately identified when embedded in a soil matrix. This minimum observable concentration, referred to as the minimum detectable limit, was measured in term of the signal to noise ratios of the 103 keV gamma decay energy from Se-81m and the 265 keV gamma decay energy from Se-75. The detection limit of Selenium in soil using PAA will be reported.
 =Theory=

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 =Data/Error Analysis=
 [[LB Thesis Thin Window Analysis]]
 =Conclusion=

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 ==DAQ==
 [[LB Thesis DAQ Writeup]]
 ==Detector Efficiencies==

← Older revision		Revision as of 20:33, 8 March 2018
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	==Calibration Method==		==Calibration Method==
		+	When using the HpGe detector, the energy isn't directly given due to the fact that the energy deposited by the photon into the crystal is converted into an ADC channel number. The energy calibration is quite simple. By using calibrated sources with known activities, dates of activation, and energy lines, one can place the calibrated source in front of the HpGe detector and find which channel number corresponds to the energy line of interest. This would be a single data point in your calibration. To ensure that the calibration is of a high quality, take several sources with several different energy lines that span the channel range of the detector and compare the channel number to the energy. Once this information has been found, simply make a file with the energy the line was supposed to be, the channel number, and the standard deviation from a Gaussian fit and plot the points. Once the points are plotted a linear fit can be done to find exactly how the energy lines deviate from the raw channel number.

	=Data/Error Analysis=		=Data/Error Analysis=

← Older revision		Revision as of 17:43, 6 March 2018
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	*Include ROOT macros?		*Include ROOT macros?
		+
		+	*Include runlists?

← Older revision		Revision as of 17:42, 6 March 2018
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	[[LB May 2017 Det B Efficiency]]		[[LB May 2017 Det B Efficiency]]
		+
		+
		+	==Calibration Method==

	=Data/Error Analysis=		=Data/Error Analysis=

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 ==Detector Efficiencies==
 [[LB May 2017 Det A Efficiency]]
 [[LB May 2017 Det B Efficiency]]

← Older revision		Revision as of 17:41, 6 March 2018
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	==Detector Efficiencies==		==Detector Efficiencies==
		+	[[LB May 2017 Det A Efficiency]]
		+	[[LB May 2017 Det B Efficiency]]

	=Data/Error Analysis=		=Data/Error Analysis=

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 ==DAQ==
+[[LB Thesis DAQ Writeup]]
 ==Split Run Measurement Technique==

← Older revision		Revision as of 17:39, 6 March 2018
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	==Split Run Measurement Technique==		==Split Run Measurement Technique==
		+	Talk about how data was gathered using the split run technique. Include plot of Time vs. counts to show how time cuts are selected from a sample. Co-60 was used as a flag because it has 2 energy lines that are higher than 1000 keV, which is well away from our lines of interest. The Co-60 marker was placed in front of the detector for roughly 1 min to ensure that a clear signal was present before continuing.

	==Detector Efficiencies==		==Detector Efficiencies==