Representation of the neutron irradiator. The small cylinder represents a 0.59 microgram ²⁵²Cf source surrounded by 0.5 cm of stainless steel and 1.25 cm of lead. The neutrons are moderated by 5 cm high density polyethylene (HDPE) to moderate the neutrons. The black tube represents an acrylic tube 1.6 mm thick wrapped with a 1.6 mm thick sheet of cadmium. The lighter tube represents an acrylic tube 1.6 mm thick wrapped with 1.6 mm lead. The entire irradiator is housed in 5 cm thick HDPE. A side of the irradiator has been removed in the image for clarity.