Final answer:
The DOT classifies a material with an activity greater than 70 Bq/gram as Type A radioactive material, which is subject to specific transport regulations.
Step-by-step explanation:
According to the Department of Transportation (DOT), a material with an activity greater than 70 Bq/gram is classified as a Type A radioactive material. These materials must be handled with care and need to follow specific regulations during transport due to their potential to cause harm. Materials that meet or exceed this activity limit are subject to stringent packaging, labeling, and handling requirements to ensure safety during shipment.