Can you please tell me whether the contrast dye used in chest ct is radioactive or not? if yes then can it damage any organ?

CT scan contrast: The contrast is not radioactive. If a patient has pre-existing kidney disease, the contrast could cause a worsening of kidney function. There is also a very small chance of severe allergic reaction. Here is a link for some further information: http://www.radiologyinfo.org/en/safety/index.cfm?pg=sfty_contrast

No it is not: The contrast material used for CT is not radioactive. It is usually excreted by kidneys in 48 hours