A bill amending the California Radiation Protection Act was signed into law without comment on July 13, Gov. Jerry Brown's office reported on its website Tuesday.
AB 510, sponsored by Assemblymember Bonnie Lowenthal (D-Long Beach) modifies several elements of the original law (SB 1237) that radiology proponents considered impractical or poorly written.
The original legislation, undertaken in the wake of several high-profile cases of radiation overdoses in the state in 2009, was signed into law in 2010 and became effective July 1 of this year. Because the amendment was granted urgency status by the Legislature, AB 510 became effectively immediately upon its signing.
![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&dpr=2&fit=crop&h=167&q=70&w=250)
