Optimization of electrochemical-etching parameters for highly sensitive CR-39 fast neutron dosimeters Page: 3 of 15
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Over the last few years, CR-39 plastic* has emerged as a highly promising
personal dosimeter for fast neutrons [A179, Ne80, Be8i, To81]. This material is
extremely sensitive to nuclear charged-particles and produces etch tracks whose
sensitivity, resolution and track geometry are superior to other track producing
solids [Ca78, Cas78]. The capacity to record low-energy proton damage tracks
[A179] offers the possibility for using CR-39 with a polyethylene radiator as a
proton recoil neutron dosimeter [Cas73] having near tissue-equivalent, energy
Our current purpose is to investigate the means and benefits of better opti-
mized electrochemical etching for the revelation of fast-neutron induced damage
tracks. The effects of these improvements on critical dosimetric properties,
such as the minimum levels of detectability and quantitation of neutron dose,
MATERIALS AND EXPERIMENTAL PROCEDURES
The CR-39 was obtained from American Acrylics and Plastics, Inc., Stretford,
CO, USA. The nominal thickness of the CR-39 was 630 urn, with protection of both
surfaces by 60 um polyethylene film. It is a hard, glasslike material. Samples
were first rough cut with a sharp blade, then stacked between pieces of Lucite
and machined to circular shape in a lathe. Careful handling is essential to
prevent an increase in the background track density.
*Polymer of allyl diglycol carbonale.
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Gammage, R.B. & Chowdhury, A. Optimization of electrochemical-etching parameters for highly sensitive CR-39 fast neutron dosimeters, article, January 1, 1981; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1063569/m1/3/: accessed January 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.