Bonner Ball Neutron Detector is a science payload
aboard the International Space Station that measures
neutron radiation. Neutrons are uncharged atomic
particles that have the ability to penetrate living
tissues. Neutron radiation can affect the blood-forming
marrow in the mineral bones of human beings and
other animals. By operating the Bonner Ball in space,
neutron radiation information can be collected and
used for the development of safety measures to protect
crewmembers during long-duration space flights.
The Bonner Ball arrived on the station during STS-102
and will return to Earth on STS-108.