Conclusion
Congratulatons, you have just started your x-ray safety training.

Started because learning about x-rays and safety issues related to their use should be a life-long endeavour for every person who may use, work with, or need x-rays.

This is true because even now, 100 years after Wilheim Roentgen first used x-rays to see the livings secrets of the human body, the science and art of Medical Imaging continues to evolve.