An apparatus used for training purposes contains an external casing, a primary shielding, a secondary shielding, and a control rod. The primary shielding and the secondary shielding are positioned within the external casing. The control rod and the secondary shield are used to adjust the radiation levels emitted from a radiation source placed within a hollow cylindrical portion of the control rod. A first rod receiving hole traverses the primary shielding. Likewise, a second rod receiving hole traverses the secondary shielding. The first rod receiving hole and the second rod receiving hole are concentrically aligned with a central receiving hole of the external casing to form a channel for the control rod to be slidably positioned.