I shot a roll of Tri-X rated at 320ASA, the day was cloudy. After developed in 1:50 Rodinal at 20*C for 11.5 min, I got a low contrast negtives. Is that because the less development time or becuse this roll of film has been passed twice under the airport X-ray machine. I am asking is because Tri-X always give me good results before. Thanks.