You plan to take a AP x-ray of the cervical spine. You plan to perform this with a source to image distance of 180cm. You plan to use a kV of 80, an mA of 19 and time of 0.2 seconds to achieve optimum image density and contrast. When you run through this plan with your supervisor he advises you that it would be better to change the distance to 100cm. When you make this change what mAs should be used? Please answer to 1 decimal place, do not use units. Answer: