Article 5

the sealed sources or radioactive waste to which it relates have essentially the same physical and chemical characteristics,

the sealed sources or radioactive waste to which it relates do not exceed the levels of activity set out in the declaration, and

the shipments are to be made from the same holder to the same consignee and involve the same competent authorities.

2.   The declaration shall be valid for a period of hot more than three years from the date of stamping by the competent authority as referred to in Article 4 (2).