Reducing the effects of radiation / flushing radiation out? Supplements, meds, what?

Yesterday, I received a CAT scan of my chest and abdomen. I'm in my 50s, and I've had two CAT scans in the past in the same area. I've also had excessive radiation exposure in my 20s when a Radiologist left the machine on for an extended time. I'm very concerned about getting new cancer from this CAT scan, since it's like getting 500 x-rays at once in addition to the radiation I've had in the past.

Since last night, I've taken the following meds...

Potassium Iodide
5g Fiber (soluble)
3g (37% Pectin) Grapefruit Pectin
20mg Resveratrol
Fish Oil - 675mg EPA, 450mg DHA
3000mg Spirulina
42mg Chlorophyll
1130mg Hawthorn Berries
5mg Melatonin
50mg Acai
125mg Green Tea
450mg Echinacea/Goldenseal Blend
GNC Womens Ultra Mega Active Multivitamin

I've also bought activated charcoal, and I'm planning to take that soon once the recent pills I've taken have had a chance to be absorbed.

My question is: what can I do to help flush out radiation I've received, repair damage to my body, prevent further damage, lessen the risk of cancer, etc... What can I do, take, eat, etc... that can help to lessen the negative effects of the radiation I've received? How long should I be taking them?

What meds/supplements/foods should I be taking and in what forms/doses?

I've done a ton of searches online, hence the wide variety I've taken, but I just don't know what is likely to work or what may be unnecessary or even counteract the effects of other things I'm taking.

Any help would be greatly appreciated.

Thank you very much.