X-ray fluorescence and Moseley's law  ![]()
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Unknown Principle The irradiation of iodine, barium (sulfat), silver and tin with soft gamma-radiations gives rise to Ka radiations characteristics of these elements. The X-ray spectra are recorded with a gamma spectrometer consisting of a scintillation counter, a pulse height analyser and a recorder. After calibration of the spectrometer, the Rydberg constant is determined from the energies of the X-ray lines, using Moseley's law. Benefits - A high ranking nuclear physics experiment can be performed by students within some hours
- The combination of multichannel analyzer (MCA), gamma detector and high precision HV power supply leads to precise results
- Fundamental Rydberg's constant and Mosley's law are easily determined
Tasks - Calibration of the gamma-spectrometer in the low energy range, using the Ba-resonance line Cs-137 emitter (32 keV) and the gamma-line of 241 Am at 59.6 keV.
- Recording of the X-ray fluorescence spectra (Ka-lines) of different elements and determination of the corresponding energies.
- Plotting of the measured X-ray energies according to Moseley's law against (Z-1) 2 and determination of the Rydberg constant R; from the slope of the resulting lines.
Learning objectives - Binding energy
- Photoelectric eftect
- Shell structure of electron shells
- Characteristic X-ray radiation
- g-spectrometry
- X-ray spectral analysis
Scope of delivery |
Radioactive source Am-241, 370 kBq
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09090-11
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1
| |
Radioactive source Cs-137, 37 kBq
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09096-01
|
1
| |
PHYWE Multichannel Analyser (MCA)
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13727-99
|
1
| |
Gamma detector
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09101-00
|
1
| |
PHYWE High precision power supply 1.5 kV DC
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09107-99
|
1
| |
High-voltage connecting cable
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09101-10
|
1
| |
measure Software multi channel analyser
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14452-61
|
1
| |
Tin-II chloride 250 g
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31991-25
|
1
| |
Silver foil, 150 x150 x 0.1 mm, 25g
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31839-04
|
1
| |
Absorption material, lead
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09029-01
|
1
| |
Plastic sack, flat, DIN A5, 100pc
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46444-01
|
1
| |
Alligator clips, bare, 10 pcs
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07274-03
|
1
| |
Stand rods, stainless steel, various sizes
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02031-00
|
3
| |
Tripod base, triangular, for 6 rods
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02007-55
|
1
| |
Universal clamp
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37715-01
|
1
| |
Right angle clamp expert with fulcrum screw
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02054-00
|
3
| |
Support rod with hole, stainless steel, 10 cm
|
02036-01
|
1
| |
Spring balance holder
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03065-20
|
1
| |
Barium sulphate 500 g
|
30035-50
|
1
| |
Iodine resublimed 25 g
|
30093-04
|
1
| |
Screened cable, BNC, l = 1 m
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07542-11
|
1
|
|
Service
