AB 510, the California bill that amends the California Radiation Protection Act that took effect on July 1, passed the state Legislature on Thursday and was sent to Gov. Jerry Brown for his signature at the close of the workday.
Brown now has 12 days -- until July 17 -- to sign the bill, veto it entirely or by line item, or let it take effect without his signature, the governor's office told AuntMinnie.com. The law was given "urgency" status, meaning that it will take effect immediately when signed, or after the 12-day waiting period expires, whichever applies.
AB 510 modifies several elements of the original law (SB 1237) that radiology proponents considered impractical or poorly written. This includes a provision that, as originally written, might have triggered a report to the state's Department of Public Health whenever a contiguous scan area was irradiated with CT, however routine (e.g., scanning the lower lungs during an abdominal CT scan).
Brown has made no statement favoring or opposing the legislation.




















![Images show the pectoralis muscles of a healthy male individual who never smoked (age, 66 years; height, 178 cm; body mass index [BMI, calculated as weight in kilograms divided by height in meters squared], 28.4; number of cigarette pack-years, 0; forced expiratory volume in 1 second [FEV1], 97.6% predicted; FEV1: forced vital capacity [FVC] ratio, 0.71; pectoralis muscle area [PMA], 59.4 cm2; pectoralis muscle volume [PMV], 764 cm3) and a male individual with a smoking history and chronic obstructive pulmonary disorder (COPD) (age, 66 years; height, 178 cm; BMI, 27.5; number of cigarette pack-years, 43.2, FEV1, 48% predicted; FEV1:FVC, 0.56; PMA, 35 cm2; PMV, 480.8 cm3) from the Canadian Cohort Obstructive Lung Disease (i.e., CanCOLD) study. The CT image is shown in the axial plane. The PMV is automatically extracted using the developed deep learning model and overlayed onto the lungs for visual clarity.](https://img.auntminnie.com/mindful/smg/workspaces/default/uploads/2026/03/genkin.25LqljVF0y.jpg?auto=format%2Ccompress&crop=focalpoint&fit=crop&h=112&q=70&w=112)