Unusual capabilities and new programs Page: 2 of 13
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
UNUSUAL CAPABILITIES AND NEW PROGRAMS
D. H. Janney
Los Alamos National Laboratory, Los Alamos, New Mexico
At the Los Alamos National Laboratory we have expanded Nondestructive
Evaluation (NDE) as necessary to meet a number of needs beyond those that
have been typically encountered within the nuclear weapons community.
These needs are met with a variety of technologies that can be trAnsferred
to the problems of the weapons community. In that sense, to this audience,
these technologies are solutions looking for problems. A major purpose of
WANTO must be to help match solutions and problems. For this reason, we
use this paper to present WANTO with a number of NDE technologies which
have had only minimal impact on weapons activities. We do this without
We sometimes need to know what trace chemical elements are present in
a material. X-ray fluorescence offers a means for making this determina-
tion. Any chemical element can be excited to x-ray fluorescence. An x-ray
source of pnnton energies greater than those of the fluorescent photons is
required. Photons from the primary source remove electrons from the atoms
of the material, leaving the atoms excited. As the atoms return to their
normal state, they emit x-rays that have energies characteristic of the
atoms. Thus, enerqy-resolved, photon-:nunting methods can be used to iden-
tify the atomz. Mtimic concentrations of a few tens of pares per million
are routir'dy detectable. The limit in any specific case will be dependent
upon the atomic numbers of the trace materials in questici and of the mate-
rial in hich these traces are embedded.
We do most of our x-ray fluorescence excitation with radioisotope
sources. The only requirement is that the source have photon vmiss ion at
high enough energy to excite the atoms under study. Isotcoes often used
for excitation are Iron-5b, Cadmium-109 and Samarium-145. Wi th these
Here’s what’s next.
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Janney, D.H. Unusual capabilities and new programs, article, January 1, 1981; United States. (digital.library.unt.edu/ark:/67531/metadc1212186/m1/2/: accessed February 19, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.