<p>SOUTH OF BAGHDAD — In a valley sculpted by man, between the palms and roses, lies a vast marble and steel city known as Al-Tuwaitha.</p>
<p>In the suburbs about 18 miles south of the capital's suburbs, this city comprises nearly 100 buildings — workshops, laboratories, cooling towers, nuclear reactors, libraries and barracks — that belong to the Iraqi Atomic Energy Commission.</p>
