  Transmission-type elastic recoil detection analysis (T-ERDA) using 8.02 MeV
He has been successfully applied to determine the concentration of ubiquitous
deuterium in mylar and PPS films, both containing hydrogen as a component. The
determined D/H ratios of $(1.60\pm 0.08) \times 10^{-4}$ and $(1.23\pm 0.08)
\times 10^{-4}$ for mylar and PPS, respectively, are only slightly deviated
from the Standard Mean Ocean Water value of $1.55\cdots \times 10^{-4}$. These
results indicate potential sensitivity of T-ERDA for analysis of the variation
of ubiquitous deuterium in hydrogen-containing materials. Such deuterium
analysis might be useful for unique characterization of not only natural, but
also synthesized hydrogen-containing materials.
