<div class="description">
<p>Journal of Research of the National Institute of Standards and Technology
</p>
<br>Subjects:  large area source; calibration;  efficiency curve;  x-ray</div>
<div class="fn value">
<dl><dd>Hutchinson, J.M.R.</dd>
<dd>Unterweger, M.P.</dd>
<dd>Hodge, P.A.</dd></dl></div>
Internet Archive identifier