Beryllium
Be Beryllium is a relatively rare element in both the Earth and the universe. The element is not known to be necessary or useful for either plant or animal life. It is extremely toxic, thats why its practical use is somewhat limited. It has one of the highest meltinhg points of all the light metaksm and it has exceptional flexural rigidity. It has the abilty to reduce water when its oxide film is removed, that means it is very hard to produce this metal in its pure form. Beryllium wiki
Filiming Concepts
Windows for X-ray and other Radiation
It can be used as windows for xrays and other radiation chambers, because of its very low absorbtion of radiation. The purity of the Beryllium is extremely important on determining the quality of the x-ray images, if the Be is impure it can leave artifacts in the xray image.
The Large Haydron Collider
Cern again! -cause its that cool!
Anyways the large haydron colliders accelorator ALICE uses Be uses a beryllium beam-pipe. Because if Be's low atomic numer, it is almost transparent to energetic particles. Therefore one uses Be in the beam pipe arround the collision region in collider particle physics.