Radioactive storage container

A container comprising:

• a two-piece lid including a plate and a connector, wherein the connector includes a first leg and a second leg and wherein the first leg of the connector includes internal threads;
• a base defining a cavity with an open end and a closed end, wherein the base includes a collar with external threads;
• and
• an O-ring configured to form a seal between the two-piece lid and the base,
• wherein the internal threads on the first leg of the connector are configured to engage the external threads of the collar in response to rotation of the two-piece lid relative to the base, wherein the second leg of the connector is configured to drive the plate towards the base in response to the internal threads on the first leg of the connector engaging the external threads of the collar, and wherein the O-ring is configured to form the seal as the internal threads on the first leg of the connector engage the external threads of the collar.