need help in verifying quality /price of ultra pure aluminum

[NPortman]

Hi,
I would appreciate your help on that:
There is an Ultra high purity aluminum stock calimed to worth USD 200,000 / kg.

I need to verify this value...

I am told that the lower the 'alpha-particle emission rate' is - the (very much) more expensive the material is;

my question is, Any other key parameters should I check with the guys possess this material for the above purpose?
I'm attaching a (poor quality) prints.. not sure if they'll conribute ..

Thanks very much!