The magnetic rays no longer function.

But the problem with radiation is that it's odorless and invisible.

Then, external detectors (gamma cameras) capture and form images from the radiation emitted by the radiopharmaceuticals.

Journalist Lisa Katayama and filmmaker Jason Wishnow are documenting the lives of people dealing with radiation in a post earthquake Japan.

It is not believed his carcinoma was a result of his work with ionizing radiation because of the brief time he spent on those investigations, and because he was one of the few pioneers in the field who used protective lead shields routinely.