The total transport index of all radioactive material packages in a single vehicle must not exceed ____.

The total transport index (TI) of all radioactive material packages in a single vehicle is a critical factor to consider for ensuring safety when transporting radioactive materials. The correct limit is set at 50, which is specified in the regulations governing the transport of radioactive materials.

The transport index is a measure that indicates the level of radiation emitted from the package, which is crucial for assessing the potential risk during transport. It helps to ensure that the cumulative radiation exposure does not reach levels that could be hazardous to public health or safety.

By capping the total transport index at 50, regulations ensure that even when multiple packages are transported together, the combined radiation does not exceed safe levels. This limit takes into account various factors, such as the total quantity of radioactive material and the mode of transport, prioritizing the safety of transport workers, the public, and the environment.

Options that suggest lower limits, such as 25, 10, or even a higher limit like 100, do not align with regulatory requirements and the understanding of safe practices in the transport of hazardous materials. The established cap is based on thorough analysis and aims to minimize risk while allowing the transport of necessary materials for medical, industrial, or research purposes.