Skin Damage

Yes. Sun exposure during radiation treatments is not advised. Radiation damages the skin and sun exposure could make the burning worse and more painful.

It's best to keep the treated area completely out of the sun.

After your radiation treatment is done, the skin that has been exposed to radiation may be more sensitive to the sun than it was in the past. You can go out in the sun and have fun, but continue to protect your skin.

Use a sunblock that is rated SPF 30 or higher on the area that was treated. (A strong sunblock is a very good policy for every inch of your body.)
Apply the sunblock 30 minutes before you go out in the sun. Reapply the sunblock every few hours, as well as when you get out of the water. Yes. Sun exposure during radiation treatments is not advised. Radiation damages the skin and sun exposure could make the burning worse and more painful.

It's best to keep the treated area completely out of the sun.

After your radiation treatment is done, the skin that has been exposed to radiation may be more sensitive to the sun than it was in the past. You can go out in the sun and have fun, but continue to protect your skin.

Use a sunblock that is rated SPF 30 or higher on the area that was treated. (A strong sunblock is a very good policy for every inch of your body.)
Apply the sunblock 30 minutes before you go out in the sun. Reapply the sunblock every few hours, as well as when you get out of the water.