2011 Photo looking SW from Flatbush Ave. Reportedly the
reactor might have been under the cafeteria.
If HSTC had a reactor it was probably a small pool type as seen in the above stock
photo. The reactor sat at the bottom of a pool of water with the water providing shielding of the radioactivity.
In 2015 a contributor gave us this lead brick which
he said he got from the former reactor area
at HSTC. No, it is not radioactive.