| 1. |
|
|
| 2. |
- Akselsson, Roland, et al.
(författare)
-
A Beam Mapping Method
- 1971
-
Ingår i: Nuclear Instruments and Methods. - North-Holland Publishing Co.. ; 91:4, s. 663-664
-
Tidskriftsartikel (refereegranskat)
|
|
| 3. |
- Akselsson, Roland, et al.
(författare)
-
Elemental Abundance Variation with Particle Size in Aerosols from Welding Operations
- 1974
-
Ingår i: Proceedings of the Second International Conference on Nuclear Methods in Environmental Research. ; s. 395-401
-
Konferensbidrag (refereegranskat)abstract
- The effect of airborne particulate matter on human health is today of considerable research interest. Essential parameters include elemental composition sampling with low pressure cascade impactors and analysis by particle induced x-ray emission spectroscopy (PIXE). It is shown that the aerosol generated by arc welding operations is several orders of magnitude denser than aerosols in ambient air. Most of the mass is found on particles between 0.1 and 1µm diameter, but the size distribution differs from one welding technique to another. The relative composition of the aerosol is found to differ significantly from that of both the welding piece and the electrode indicating the presence of fractionation of the type indicated in this work in designing electrodes and welding pieces to minimize the health hazards associated with the welding.
|
|
| 4. |
|
|
| 5. |
|
|
| 6. |
|
|
| 7. |
|
|
| 8. |
|
|
| 9. |
|
|
| 10. |
- Akselsson, Roland, et al.
(författare)
-
X-Ray Production by 1.5-11 MeV Protons
- 1974
-
Ingår i: Zeitschrift für Physik. - Springer-Verlag. ; 266:4, s. 245-255
-
Tidskriftsartikel (refereegranskat)abstract
- K-shell ionization and L x-ray production cross-sections by proton impact have been determined from measurements of K x-ray yields from thin targets of Ti, Fe, Co, Cu, Ni and Ag and of L x-ray yields from Au and Pb. The proton energies varied from 1.5 to 11 MeV. A Si(Li) semiconductor detector recorded the x-rays. The total error in the measured cross-sections is mostly less than 5 %. Kβ/Kα, ratios and Lι,β,ƴ/Lα, ratios have been determined. Ionization cross-sections have been compared with predictions of the plane-wave Born approximation (PWBA) and the binary-encounter approximation (BEA). Both theories describe the ionization quite well: PWBA is, however, better for higher proton energies whereas BEA is superior for lower energies. An empirical formula for ionization cross-sections is derived.
|
|
