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When you're asked to have a CT scan or a nuclear scan, do you know how much radiation that involves? How many of those sorts of scans have you already had? Is it necessary? Is there an alternative? I don't think many people know about that.

The bottom line is how do we best provide for the security of the traveling public in light of a determined enemy who is adept at constructing well-designed, well-concealed devices which would not show up in a walk-through metal detector? We're trying to employ the best technology to identify any possible threat.

I've been focused on detecting nuclear terrorism at ports, in cargo containers, and I developed and built detectors that are extremely cheap and also very sensitive. My other big development is a system to produce medical isotopes that are injected into patients and used to diagnose and treat cancer.

I developed a counterterrorism device that's revolutionizing the way we detect nuclear materials.

Most medical physicists work in the physics of radiation oncology making sure that the desired dose is given to the cancer and the dose to normal tissues are minimized.

My experiments proved that the radiation of uranium compounds can be measured with precision under determined conditions and that this radiation is an atomic property of the element of uranium.

As part of our layered approach, we have expedited the deployment of new Advanced Imaging Technology (AIT) units to help detect concealed metallic and non-metallic threats on passengers. These machines are now in use at airports nationwide, and the vast majority of travelers say they prefer this technology to alternative screening measures.

NASA wanted to assure its ability to examine the spacecraft in orbit for signs of damage.

When I hold something that's radioactive, it's kind of an indescribable feeling. It's kind of like when I'm with my girlfriend.