PAA Sage

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PAA_Research PAA on Sage Brush


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

MagInSagePAA 7-3-2017.png

10perc 07032017 1369keVLin.png


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 1hr 52 min 20 sec
Mn CS-137 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 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
Se Cs out at , Se in at
Cs Se out at , Cs in at
Ash Cs out at , Ash in at
Cs Ash out at 2325 , Cs in at
Se Cs out at , Se in at
Cs Se out at , Cs in at
Ash Cs out at , Ash in at