21. |
|
|
22. |
- Malmqvist, Klas, et al.
(författare)
-
Performance of a Personal Low-Weight Aerosol Sampler with Particle Size Fractionation and Time Resolution
- 1983
-
Ingår i: Journal of Aerosol Science. - : Elsevier BV. - 0021-8502. ; 14:3, s. 409-413
-
Konferensbidrag (refereegranskat)abstract
- A low-weight aerosol sampler has been developed and tested. Internal losses for both sub-micron and large particles ( < 10 tam) are of the order of 5 %. The size fractionation patterns indicate that the sampler may be used to collect a separate respirable fraction in good agreement with the BMRC standard and a coarse fraction deternuned by the inlet design.
|
|
23. |
- Swietlicki, Erik, et al.
(författare)
-
PIXE Detection Limits for some Aerosol Collection Substrates by Excitation with protons and 4He2+ Ions from a 3 MV Tandem Accelerator
- 1984
-
Ingår i: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; :1084, s. 441-445
-
Tidskriftsartikel (refereegranskat)abstract
- Comparisons of PIXE detection limits for K, X rays using 2-5 MeV protons and 7-8 MeV 4He2+ ions as projectiles have been performed. The comparisons have been made for common aerosol backings. According to simple theoretical considerations regarding X-ray production cross sections and the production of background radiation, detection limits for 4He2+ should be two to four times lower than for protons for equal vefoeity projectiles of equal numbers. However, the background in X-ray spectra arising from gamma-quanta being Compton scattered in the Si(Li) detector can strongIy affect the detection limits. The detection limits using protons and 4HeZ+ ions from a 3 MV electrostatic tandem accelerator are determined and discussed.
|
|