| 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 |
|
| 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 |
|
| 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 |
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 |
| ELBD ARCHIVE |
EPA 600-2-78-194 |
Received from HQ |
AWBERC Library/Cincinnati,OH |
10/04/2023 |
| ESAD |
EPA 600-2-78-194 |
|
Region 10 Library/Seattle,WA |
03/23/2010 |
| NTIS |
PB-288 512 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| 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." |
| Place Published |
Research Triangle Park, N.C. |
| Supplementary Notes |
See also report dated Mar 77, PB-266 671. |
| Access Notes |
Also available via World Wide Web. |
| Corporate Au Added Ent |
United States. Environmental Protection Agency.; United States. Environmental Protection Agency. Office of Research and Development.; Environmental Sciences Research Laboratory.; Naval Research Laboratory (U.S.). Radiation Technology Division. |
| Title Ser Add Ent |
Research reporting series. Environmental protection technology ; EPA-600/2-78-194. |
| PUB Date Free Form |
1978 |
| Series Title Untraced |
Environmental protection technology series ; EPA-600/2-78-194 |
| NTIS Prices |
PC A03/MF A01 |
| BIB Level |
m |
| Medium |
unmediated |
| Content |
text |
| Carrier |
volume |
| Cataloging Source |
OCLC/T |
| OCLC Time Stamp |
20160419143151 |
| Language |
eng |
| Origin |
OCLC |
| Type |
MERGE |
| OCLC Rec Leader |
01811cam 2200409Ki 45020 |
