Sixteen irradiation positions located in the permanent reflector are referred to as the small vertical experiment facilities (VXF). Each of these facilities has a permanent aluminum liner having an inside diameter of 1.584 in. (4.02 cm). The facilities are located concentric with the core on two circles of radii 15.43 in. (39.2 cm) and 17.36 in. (44.1 cm), respectively. Those located on the inner circle (11 in all) are referred to as the inner small VXFs. Those located on the outer circle (five in all) are referred to as the outer small VXFs. Normally, non-instrumented experiments are irradiated in these facilities. VXF-7 is dedicated to one of the pneumatic irradiation facilities that supports the Neutron Activation Analysis Laboratory and is unavailable for other use.