We acquired a 241 Am spectrum (empty environment) with the following conditions:
- High power to the junction (60V)
- Amplifier (fine gain: 70, high gain: 10, unipolar output)
- 8192 channel analyzer
We use the test generator, and adjust the U potentiometer (Amplitude) so that the test pulses have the same height (same channel here C=5530) as those issued by the junction with the corresponding alpha particles at 5.48 MeV. When this is accomplished ( Range=1V, Normalize=9 Amplitude(U)=57), we accumulated spectrum test pulses by varying U and accumulating the spectrum of test pulses. For each value of U we look for the corresponding channel. As U is the proportional to E, then we get the calibration E=f(C)
Then the 230Th source is placed in the counting position and determining the centers of the peaks. From the calibration curve energies are determined.
However, when compared with the tabulated energies, there is a problem!!!
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There seems to be a problem with the Th 230 implementation. I checked the source code, however the energies were entered correctly, even taken the kinetic constants into account. I will let you know as soon as a new version of RADlab becomes available with the necessary fixes.It should be uploaded in a few days.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
We acquired a 241 Am spectrum (empty environment) with the following conditions:
- High power to the junction (60V)
- Amplifier (fine gain: 70, high gain: 10, unipolar output)
- 8192 channel analyzer
We use the test generator, and adjust the U potentiometer (Amplitude) so that the test pulses have the same height (same channel here C=5530) as those issued by the junction with the corresponding alpha particles at 5.48 MeV. When this is accomplished ( Range=1V, Normalize=9 Amplitude(U)=57), we accumulated spectrum test pulses by varying U and accumulating the spectrum of test pulses. For each value of U we look for the corresponding channel. As U is the proportional to E, then we get the calibration E=f(C)
Then the 230Th source is placed in the counting position and determining the centers of the peaks. From the calibration curve energies are determined.
However, when compared with the tabulated energies, there is a problem!!!
Alpha calibration
There seems to be a problem with the Th 230 implementation. I checked the source code, however the energies were entered correctly, even taken the kinetic constants into account. I will let you know as soon as a new version of RADlab becomes available with the necessary fixes.It should be uploaded in a few days.