From TSA: traveling with film:
General Use Film
You should remove all film from your checked baggage and place it in your carry-on baggage. The X-ray machine that screens your carry-on baggage at the passenger security checkpoint will not affect undeveloped film under ASA/ISO 800.
If you desire to have it inspected by hand, you may be required to open the box, canister, or wrapper so our Security Officer can inspect it. We recommend leaving your film in the unopened manufacturers packaging.
General Use Film
You should remove all film from your checked baggage and place it in your carry-on baggage. The X-ray machine that screens your carry-on baggage at the passenger security checkpoint will not affect undeveloped film under ASA/ISO 800.
If you desire to have it inspected by hand, you may be required to open the box, canister, or wrapper so our Security Officer can inspect it. We recommend leaving your film in the unopened manufacturers packaging.