Classification complete
2844 42 90
Non-artificial actinium-225, actinium-227, californium-253, curium-240 to curium-244, einsteinium-253 or -254, gadolinium-148, polonium-208 to polonium-210, radium-223, uranium-230 or uranium-232, and products containing them
The spaces only make the code easier to read. Customs declarations normally use the unspaced form, 28444290.