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RECORD NUMBER: 10 OF 12

OLS Field Name OLS Field Data
Main Title X-ray analysis of airborne asbestos : final report: design and construction of a prototype asbestos analyzer /
Author Birks, L. S. ; Gilfrich, J. V. ; Sandelin, J. W.
Other Authors
Author Title of a Work
Birks, L. S.
Gilfrich, J. V.
Sandelin, J. W.
Wagman, Jack.
CORP Author Naval Research Lab., Washington, DC. Radiation Technology Div.;Environmental Sciences Research Lab., Research Triangle Park, NC.
Publisher U.S. Environmental Protection Agency, Environmental Sciences Research Laboratory, Office of Research and Development,
Year Published 1978
Report Number EPA-600/2-78-194
Stock Number PB-288 512
OCLC Number 52543825
Additional Subjects Asbestos ; X ray diffraction ; Serpentine ; Design ; Performance evaluation ; Gas analysis ; Chemical analysis ; X ray analysis ; Air pollution detection
Internet Access
Description Access URL
https://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=910184P5.PDF
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
EHAM  EPA-600/2-78-194 Region 1 Library/Boston,MA 05/25/2016
EJBD ARCHIVE EPA 600-2-78-194 Headquarters Library/Washington,DC 07/15/2014
EJBD  EPA 600-2-78-194 Headquarters Library/Washington,DC 10/31/2016
EKBD  EPA-600/2-78-194 Research Triangle Park Library/RTP, NC 07/04/2003
ESAD  EPA 600-2-78-194 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB-288 512 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 01/01/1988
Collation iii, 21 pages : illustrations ; 28 cm.
Abstract
A prototype asbestos analyzer has been designed and constructed for use by the Environmental Protection Agency. It incorporates the principle of broad-beam x-ray optics and the special fiber-aligned sample described in earlier reports (PB-241 285 and PB-266 671). The prototype instrument uses two detectors for simultaneous measurement of diffracted signal and background; the mass of asbestos is simply the net difference in intensity for these two detectors normalized by the sensitivity of the analyzer as determined using standards. The prototype analyzer is contained in a vacuum box 15x15x32 cm and mounts on top of a standard commercial x-ray power supply. It uses a Cr target spectrographic tube which is located in a separate lead-shielded enclosure in the box. The mechanics of selecting the 2 theta diffracting angles for different forms of asbestos are unique and especially designed to minimize the space required. The beam trap is a critical component of the instrument; it reduces the backscattered noise signal to less than 100 photons/sec from an incident beam of about 10 to the 11th power photons/sec. Preliminary tests with the analyzer indicate a sensitivity of 18 photons per second per microgram of chrysotile and a calculated sigma detection limit of 0.1 microgram for a 500 second measurements. Amosite has a somewhat better sensitivity and detection limit.
Notes
Project Officer: Jack Wagman. Radiation Technology Division, Naval Research Laboratory "August 1978." "EPA-600/2-78-194."