That dose is about 10,000 times that typical exposure rate for the U.S., but it is applied to the cancerous tissue; the total-body exposure during radiation therapy is much less.

That dose is about 10, 000 times that typical exposure rate for the U.S., but it is applied to the cancerous tissue; the total-body exposure during radiation therapy is much less.

Results:The comet rate and comet length of each tissue DNA in test groups increased significantly(P<0.05)compared with control group. And it showed a good dose-response relationship.