Fish are vertebrate animals, that is, they all have a vertebral column or âspineâ. There are two main groups of fish, bony fish (Teleosts) and cartilaginous fish (Elasmobranchs). As the common names imply, the skeletons of teleosts are made of bone while the elasmobranchs have cartilaginous skeletons.
Villard found a third type of radiation from pitchblende: gamma rays, which were much the same as X-rays. Then in 1896 Pierre and Marie Curie gave the name 'radioactivity' to this phenomenon, and in 1898 isolated polonium and radium from the pitchblende.
The Original Radon Expertsâ¢. Radiation Data is the leading provider of radon testing and mitigation services in New Jersey and Eastern Pennsylvania. Our testing lab was founded in 1983 by a nuclear physicist (Ph.D.) with a deep proficiency for radiation detection.adiation Data is the leading provider of radon testing and mitigation services in New Jersey and Eastern Pennsylvania.