Answer:
To see beyond and into the body, car manufacturer use penetrating radiation
Step-by-step explanation:
Some types of car scanners are not backscatter devices, like those used at border checkpoints. To see beyond and into the body, car manufacturer use penetrating radiation. Such devices emit radiation that penetrates the car and skin. That's why we expose the vehicle's passengers to radiation.
The maximum dose of radiation per scanning would be around 0.05 microsievert (μSv) per test for a person in a car going through one of car scanners.