Radiation in our daily life (cSv)
Chest X-ray 0.002
Lumbar spine X-rays 0.13
Barium enema 0.7
CT abdomen 0.8
Living in Houston for one year 0.09
Living in Denver for one year 0.3
Acute radiation syndrome
Reduction in the number of blood cells
Temporary sterility in males
Acute radiation syndrome (continue)
Space Radiation Health Project
What are the risks from exposure to space radiation?
How to reduce the risks?
Carcinogenesis -- Increased cancer morbidity or mortality risk in astronauts may be caused by occupational radiation exposure
Acute and late CNS risks -- Acute and late radiation damage to the central nervous system (CNS) may lead to changes in motor function and behavior, or neurological disorders.
Chronic and degenerative tissue risks -- Radiation exposure may result in degenerative tissue diseases (non-cancer or non-CNS) such as cardiac, circulatory, or digestive diseases, as well as cataracts.
Acute radiation risks -- Acute radiation syndromes may occur due to occupational radiation exposure.
ALARA (As Low As Reasonably Achievable) principle
Radiation exposure limits
The dose limit for terrestrial radiation workers is 5 cSv per year
Space radiation monitoring
Dose equivalent (LET)
Charged particle type and energy
What are the evident biological effects of space radiation in astronauts?
Numbers provided by Mary Wear
Budinger, Lyman and Tobias,
Brenner et al. Rad. Res. 1993