On the threshold conditions for electron beam damage of asbestos amosite fibers in the transmission electron microscope (TEM).
Asbestos amosite fibers were investigated to evaluate the damage caused by a transmission electron microscope (TEM) electron beam. Since elemental x-ray intensity ratios obtained by energy dispersive x-ray spectroscopy (EDS) are commonly used for asbestos identification, the impact of beam damage on...
| Publicado en: | Journal of Occupational & Environmental Hygiene Vol. 13; no. 12; pp. 924 - 936 |
|---|---|
| Autores principales: | , , , |
| Formato: | equations & formulas research tables/charts Journal Article |
| Publicado: |
Taylor & Francis Ltd
Dec2016
|
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=119092970&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 119092970 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 15459624 V1L jtl: Journal of Occupational & Environmental Hygiene issn: 15459624 maglogo: Y pubinfo: dt: Dec2016 vid: 13 iid: 12 pid: 377 pub: Taylor & Francis Ltd place: Philadelphia, Pennsylvania artinfo: ui: 119092970 119092970 119092970 10.1080/15459624.2016.1191638 119092970 ppf: 924 ppct: 12 formats: fmt: – @attributes: type: T – @attributes: type: P tig: atl: On the threshold conditions for electron beam damage of asbestos amosite fibers in the transmission electron microscope (TEM). aug: au: Martin, Joannie Beauparlant, Martin Sauvé, Sébastien L'Espérance, Gilles affil: Institut de recherche Robert-Sauvé en santé et en sécurité du travail (IRSST) Montréal, Québec, Canada sug: subj: Asbestos Microscopy, Electron Energy Density Human Research Methodology Spectrometry, X-Ray Emission ab: Asbestos amosite fibers were investigated to evaluate the damage caused by a transmission electron microscope (TEM) electron beam. Since elemental x-ray intensity ratios obtained by energy dispersive x-ray spectroscopy (EDS) are commonly used for asbestos identification, the impact of beam damage on these ratios was evaluated. It was determined that the magnesium/silicon ratio best represented the damage caused to the fiber. Various tests showed that most fibers have a current density threshold above which the chemical composition of the fiber is modified. The value of this threshold current density varied depending on the fiber, regardless of fiber diameter, and in some cases could not be determined. The existence of a threshold electron dose was also demonstrated. This value was dependent on the current density used and can be increased by providing a recovery period between exposures to the electron beam. This study also established that the electron beam current is directly related to the damage rate above a current density of 165 A/cm2. The large number of different results obtained suggest, that in order to ensure that the amosite fibers are not damaged, analysis should be conducted below a current density of 100 A/cm2. pubtype: Academic Journal doctype: equations & formulas research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
|---|