<div class="description">
<p>Journal of Research of the National Institute of Standards and Technology
</p>
<br>Subjects:  radium-226; calibration;  electret;  E-PERM(R);  environment;  ionization chamber;  radon-222;  measurement</div>
<div class="fn value">
<dl><dd>Colle, R.</dd>
<dd>Kotrappa, P.</dd>
<dd>Hutchinson, J.M.R.</dd></dl></div>
Internet Archive identifier