| radiobiology |
the branch of biology concerned with the effects of radiation on living tissue and the use of radioactive tracers in the study of biological processes. |
| radiocarbon |
a radioactive isotope of carbon, esp. the isotope that has a nuclear mass of fourteen daltons and is often used in determining the age of various organic materials; carbon 14. |
| radiochemistry |
the branch of chemistry dealing with the study of radioactive elements. |
| radio compass |
a navigational aid consisting of a radio receiver that determines the transmission direction of incoming radio waves. |
| radiofrequency |
any frequency of electromagnetic waves between approximately ten kilohertz and 300 gigahertz, that can be used for radio transmission. |
| radio galaxy |
a galaxy that emits a large amount of radio energy. |
| radiogram |
a message transmitted using radio signals or wireless telegraph. [2 definitions] |
| radiograph |
an image produced by the action of x-rays or other forms of radiation on a photographic film; autoradiogram; radiogram. [2 definitions] |
| radioisotope |
an unstable isotope that emits subatomic particles or energy in decaying to a more stable state. |
| radiolarian |
any small marine protozoan having an amoebalike body encased in a silica skeleton. |
| radiology |
the branch of medicine dealing with the examination of bones and internal organs using imaging techniques such as x-rays, ultrasound, and magnetic resonance. [2 definitions] |
| radiolucent |
showing little or no resistance to x-rays or other forms of radiant energy. |
| radioman |
one who operates or repairs radio equipment. |
| radiometer |
an instrument for measuring radiant energy or transforming radiant energy into mechanical energy, consisting of vertical vanes that absorb more heat on one side than the other, so that they rotate around an axis when irradiated. |
| radiopaque |
of a substance, resistant to penetration by radiation such as x-rays or gamma rays. |
| radiophone |
a telephone whose sound is transmitted by radio waves; radiotelephone. |
| radiophoto |
radiophotograph. |
| radiophotograph |
a photograph or other visual image transmitted by radio. |
| radioscopy |
the internal examination of opaque objects by means of radiation such as x-rays. |
| radiosensitive |
sensitive or susceptible to destruction by radiant energy, as living organisms or tissue. |
| radiosonde |
an airborne meteorological instrument that radios information about air temperature, pressure, and humidity to ground stations; radiometeorograph. |