Radsafe, I am in need of a U-238 standardized solution. I have contacted several manufacturers and no one can get it to me soon enough. Anything around 0.1uCi would suffice. If anyone has any extra lying around that they would be willing to sell please call me at 1(800) 383-0468 or email SSQC17a@prodigy.com. Thanks, Glenn Huber SSCQ17A@prodigy.com