What additional requirements apply to international air shipments of nuclear gauges?

The requirement for Special Form Certificate numbers is crucial when it comes to the international air shipment of nuclear gauges. This certificate is a legal document that verifies that the radioactive material is contained in packaging that meets the stringent safety requirements set by regulatory agencies. It ensures that the gauges are transported in a manner that minimizes any potential risks associated with their radioactive contents, thus providing assurance for both the transporters and the receiving entities regarding safety and compliance with international regulations.

The Special Form Certificate is necessary for the safe handling and transportation of radioactive materials, as it certifies that the material is securely packaged to prevent leakage or exposure during transit. This is particularly important in the context of international shipments, where adherence to various national and international regulations is mandatory.

The other options, while they may pertain to logistics or safety, do not specifically address the regulatory requirements for radioactive materials in the same way that the Special Form Certificate does. Shipping permits and confirmations related to driver training might be relevant in specific scenarios or locations, but they don't hold the same universal relevance to all international shipments of nuclear gauges as the Special Form Certificate does.