Brightest Gamma Ray on Earth--for a safer, healthier world
"Physicists have discovered that ultra-short duration laser pulses can interact with ionised gas to give off beams 
that are so intense they can pass through 20 cm of lead and would take 1.5 m of concrete to be completely absorbed."
"The ray could have several uses, such as in medical imaging, radiotherapy and radioisotope production for PET (positron emission tomography) scanning. The source could also be useful in monitoring the integrity of stored nuclear waste."