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| Titel: |
Nondestructive Analysis of Total Nonvolatile Carbon by Forward Alpha Scattering Technique (FAST) |
| Auteur: |
Kusko, Bruce Cahill, Thomas A. Eldred, Robert A. Matsuda, Yatsuka Miyake, Hiroshi |
| Verschenen in: |
Aerosol science and technology |
| Paginering: | Jaargang 10 (1989) nr. 2 pagina's 390-396 |
| Jaar: |
1989 |
| Inhoud: |
The oldest method of nuclear analysis, Rutherford scattering of alpha particles, is the basis of a technique we have developed that is capable of the quantitative nondestructive determination of carbon and all other elements lighter than sodium on an aerosol filter. Samples are collected on thin-stretched teflon filters, which are then placed in the 30-MeV alpha-particle beam of the Crocker Nuclear Laboratory's 193-cm cyclotron. Scattered alpha-particles are detected at the forward angles of 62 and 74 degrees, and the method has become known as FAST, for forward alpha scattering technique. The fluorine content of the air particles is assumed to be much less than the carbon content, and the filter blank carbon is subtracted from the known CF2 ratio of teflon. Sensitivities for carbon are limited by the need to subtract the 70 μg/cm2 of carbon in the filter, which can be done to ±5%, or ±3.5 μg/cm2. This amounts to ±0.15 μg/m3 for the National Park Service aerosol samples. Since the FAST analysis is done in vacuum, only nonvolatile species are measured. This technique provides an alternative way to measure carbon without using artifact-prone quartz filters. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 13 van 24 gevonden artikelen
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