| densitometry, X-ray | Measurement of the degree of darkening of X-ray film by means of a photocell which measures light transmission through the film. (12 Dec 1998) |
|---|---|
| incident ray | The ray that strikes the surface before reflection. (05 Mar 2000) |
| infrared ray | See: infrared. (05 Mar 2000) |
| fast ray | <microscopy> The fast ray or fast component for a crystal or fibre corresponds to the lower refractive index. (05 Aug 1998) |
| lateral X-ray | An X-ray picture taken from the side. (12 Dec 1998) |