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XrayAbsorptionCorrection dialog.
Table of Contents
Calculates attenuation of xrays produced by negative muons due to absorption in a sample for elemental analysis
| Name | Direction | Type | Default | Description |
|---|---|---|---|---|
| InputWorkspace | Input | MatrixWorkspace | Mandatory | The name of the input workspace. |
| MuonImplantationProfile | Input | MatrixWorkspace | Mandatory | The name of the Muon Implantation Profile. |
| OutputWorkspace | Output | MatrixWorkspace | Mandatory | The name to use for the output workspace. |
| DetectorAngle | Input | number | 45 | Angle in degrees between beam and Detector.Range of normal values for detectors are : Ge1 : 90-180 , Ge2 : 270-360 , Ge3 : 0 - 90 , Ge4 : 180 -270. |
| DetectorDistance | Input | number | 10 | Distance in cm between detector and sample. |
This algorithm calculates the correction factors due to the absorption of Xrays by the sample. This is done by determining path of an xray from a muon in sample to detector and using the calculated distance travelled by emitted xray in sample to calculate correction factor using .. math:: exp(-absorptioncoefficient(energy) * distance)
The algorithm will compute the correction factors on a bin-by-bin basis for each spectrum within the input workspace. The following assumptions on the input workspace are made:
- properties of the sample and optionally its environment have been set with SetSample
- Xray Attenuation profile data is provided by using SetSampleMaterial
- Muon Implantation Profile has a single spectrum. The x data is the muon depth in cm and the y data is intensity in counts.
Example: A cylindrical sample
CreateWorkspace(OutputWorkspace="Input", DataY=np.arange(0,8001), DataX=np.arange(0,8001))
CreateWorkspace(OutputWorkspace="MuonProfile", DataY=np.arange(1,51), DataX=np.linspace(0.1,0.2))
SetSample("Input", Geometry={"Shape": "Cylinder", "Height": 2.0, "Radius": 1.0,
"Center": [0.0,0.0,0.0]})
SetSampleMaterial(InputWorkspace="Input", ChemicalFormula="Au",XRayAttenuationProfile="Gold_Xray_Absorption_Coefficient.dat")
XrayAbsorptionCorrection(InputWorkspace="Input", MuonImplantationProfile="MuonProfile",OutputWorkspace="corrections")
xdata = mtd["corrections"].readX(0)
ydata = mtd["corrections"].readY(0)
ylen = len(ydata)
print("The middle 5 correction factors in workspace are:")
for x in range(5):
index = int(ylen/2) -3 + x
print("Energy(Kev) : {0:.4f},Factor : {1:.4f}".format(xdata[index],ydata[index]))
Output:
The middle 5 correction factors in workspace are:
Energy(Kev) : 3997.0000,Factor : 0.9466
Energy(Kev) : 3998.0000,Factor : 0.9466
Energy(Kev) : 3999.0000,Factor : 0.9466
Energy(Kev) : 4000.0000,Factor : 0.9466
Energy(Kev) : 4001.0000,Factor : 0.9466
Categories: AlgorithmIndex | CorrectionFunctions\AbsorptionCorrections
C++ header: XrayAbsorptionCorrection.h (last modified: 2020-12-18)
C++ source: XrayAbsorptionCorrection.cpp (last modified: 2020-12-18)