Revision as of 18:57, 23 May 2019

PAA_Research PAA on Sage Brush

Motivation

The volatile oil content of sage brush is known to be a strong indicator of both the flammability of sagebrush as well as its forage value for open range livestock<ref name="Sage1968">File:SageBrushMg-vs-VolOil Powell.pdf </ref>. The volatile oils in sagebrush leaves impede the growth of rumen micro-organisms thereby decreasing an animal's appetite. The amount of Magnesium in sagebrush leaves has been shown to be strongly correlated with the volatile oil content of sagebrush. We studied the potential to use Photon Activation Analysis at the Idaho Accelerator Center as a means to measure the Magnesium content of sagebrush. The figure below illustrates our ability to identify the presence of Magnesium in sagebrush leaves. With further work, this method has the potential to provide ranchers and fire prevention services with a means of monitoring the forage value and fire risk of Idaho's sagebrush population.

Preliminary results

5/23/19

Calibration Detect A

Source	Energy (keV0	Channel
Th Rod	238.8 (highest peak)	548.152
Ba-133	276.398	632.9
Th Rod	338.8 (4th highest)	772.106
Ba-133	356	811.78
Na-22	511	1159.92
Th Rod	583.4 (2nd highest peak)	1322.244
Cs-137	661.7	1497.84
Th Rod	911.2 (3rd highest)	2059.4
Na-22	1274.5	2875.50
Th Rod	2614.6	5886.485

MPA Fit: (-5.74857) + (0.445818)*x + (-2.04348e-7)*x^2

Calibration Detect D

Source	Energy (keV	Channel
Th Rod	238.8 (highest peak)	531.303
Ba-133	276.398	615.556
Th Rod	338.8 (4th highest)	253.581
Ba-133	356	792.917
Na-22	511	1138.136
Th Rod	583.4 (2nd highest peak)	1298.982
Cs-137	661.7	1473.827
Th Rod	911.2 (3rd highest)	2029.758
Na-22	1274.5	2839.048
Th Rod	2614.6	5824.23

MPA Fit: (0.0122021) + (0.449001)*x + (-3.08126e-8)*x^2

Run list

data/Dan-May 2019 Gallium run

thorium002.mpa: Thorium on A & D

cs-127-003.mpa: Thorium on A & Cs on D

Na-22-004.mpa: Thorium on A and Na-22

Ba-133-005.mpa: Thorium on A & Ba-133 on D

run list

30 MeV electrons at 120 Hz rep rate with 0.12 A and 2.1 microsec width

Irradiation began at 7:44 am Irradiation ended at 10:15 am

at 11:59 am beam off time was 1 hr 44 min

Sage Brush Ash sample ID = 190028-01 Pure Selenium sample ID = 190028-02 Nickel sample ID = 190028-03

run #	Filename	Sample in Det A	Sample In Det D	Time since Beam Off
6	SeInDMnInA_006.mpa	Mn	Se (Se-75:264 & 279 keV, 119 day half life)	1hr 52 min 20 sec
		Mn	CS-137 (661 keV)	Se out at 400, Cs in at 430
		Mn	Sage Ash	Cs out at 500, Ash in at 530
			Cs	Ash out at 930, Cs in at 950
			Se (Se-81:276 & 290 keV, 57 min half life)	Cs out at 1000 , Se in at 1040
			Cs	Se out at 1440 , Cs in at 1460
			Ni	Cs out at 1500 , Ni in at 1550 (5% deadtime during measurement)
			Cs	Ni out at 1650 , Cs in at 1675
			Ash	Cs out at 1700 , Ash in at 1725
			Cs	Ash out at 2325 , Cs in at 2350
			Se	Cs out at 2390 , Se in at 2400 (beam off 2 hr 33 min ago)
			Cs	Se out at 2800 , Cs in at 2850
			Ash	Cs out at 2900 , Ash in at 2918 (2 hr 41 min after irradiation)
			Cs	Ash out at 3350 , Cs in at
			Se	Cs out at , Se in at
			Cs	Se out at , Cs in at
			Ash	Cs out at , Ash in at

PAA_Research

@@ Line 128: / Line 128: @@
 | || ||  || Se || Cs out at 2390 , Se in at 2400 (beam off 2 hr 33 min ago)
 |-
-| || ||  || Cs || Se out at 2800   , Cs in at
+| || ||  || Cs || Se out at 2800   , Cs in at 2850
 |-
-| || ||  ||Ash || Cs out at  , Ash in at
+| || ||  ||Ash || Cs out at 2900 , Ash in at 2918 (2 hr 41 min after irradiation)
 |-
-| || ||  || Cs || Ash out at 2325 , Cs in at
+| || ||  || Cs || Ash out at 3350 , Cs in at
 |-
 | || ||  || Se || Cs out at  , Se in at

Difference between revisions of "PAA Sage"