USING DYNAMIC RADIOGRAPHY TO DETERMINE THE VOLUME OF AN IMPLODING CYLINDER Page: 4 of 6
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
LS:Ce Streak CCM
3mm Camera C anera
Star 1
1 1 1
Fall 1997 Dynamic Radiographic System
Streak M CD
Camera C Canera
Series 300
LSO:Ce
1 mm
loX 1 20X
Summer 1998 Dynamic Radiographic System
Figure 3. Component changes and relative sensitivity gains thereby achieved between the 1997 and 1998 dynamic radiographic
systems. The 1997 system used a pair of quartz singlets and four mirrors to image the radiographic image formed at the scintillator
onto the streak photocathode. All of these components were replaced in the 1998 system with a single, 5 mm by 30 mm coherent
fiber optic bundle. The other change introduced in the 1998 system was the use of a fiber-optic-coupled readout camera.
2.2. Resolution Improvements
The aforementioned improvements in sensitivity caused an improvement in resolution. With an increase in sensitivity,
acceptable signal strengths were achieved with thinner scintillators. A decrease in scintillator thickness decreased system
susceptibility to two resolution-degrading effects: radiographic blur and defocusing. The increase in sensitivity achieved by
introducing the changes noted in the 1998 system were sufficient to allow a decrease in scintillator thickness from 3 mm to
1 mm, which, in turn, resulted in an improvement in limiting resolution from 0.5 to 2 lp/mm. The significance of this
achievement can be determined from a quick glance at Table 1, a compilation of the effect of resolution on realizable
volumetric measurements. System resolution was determined by placing a tungsten resolution block at the location of the
object (figure 1), irradiating it with a pulse of gamma radiation, then recording the resulting scintillator image. A factor of
four improvement in the percent accuracy of volumetric measurements was achieved by the above-mentioned resolution
improvements to our radiographic system. The calculated values for the percent error in volumetric measurement, which
show an increase by about a factor of two for the compressed cylinder, is for an uncompressed cylinder having a radius of
7 mm.
Table 1. Precision of cylinder volume measurements as a function of radiometric system
resolution, r, is 7 mm, and AV = 2RrlAr
Resolution (lp/mm) Radial Resolution Ar (mm) % Error AVIV
0.5 1 28
1 0.5 14
2 0.25 7
Upcoming Pages
Here’s what’s next.
Search Inside
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.
LEWIS, W.; BAKER, S. & AL, ET. USING DYNAMIC RADIOGRAPHY TO DETERMINE THE VOLUME OF AN IMPLODING CYLINDER, article, July 1, 1999; Los Alamos, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc724358/m1/4/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.