X-rays originate at the

The recommended vertical angulation for exposing a mandibular premolar periapical radiograph using the bisecting technique is

Which of these statements regarding radiographic contrast is false?

Which structure is most likely to absorb or stop more of the x-rays from reaching the film?

Name the technique error  

Name the technique error.      

What caused this technique error?

The degree of overall blackness of a radiographic image is termed

If vertical angulation of the tube head is set at zero, the PID will be

The lethal dose (LD 50/30) of radiation for humans is estimated to be