Gammaalayksiköt

Gammaalayksiköt, often translated as "gamma units," refers to a system of measurement used primarily in older Finnish scientific literature, particularly in the field of radioactivity. These units are now largely obsolete and have been superseded by the International System of Units (SI).

The most common gamma unit was the roentgen, which measured the exposure dose of gamma radiation. Another related unit sometimes encountered is the rad, which measured the absorbed dose. These units were crucial for quantifying the intensity of radiation emitted by radioactive sources and for understanding its effects on materials and biological tissues.

The roentgen was defined as the amount of X-ray or gamma radiation that produces ions carrying one electrostatic unit of charge in one cubic centimeter of air at standard temperature and pressure. The rad was defined as the absorption of 100 ergs of energy per gram of absorbing material.

In modern scientific practice, these units have been replaced by SI units. The SI unit for exposure dose is the coulomb per kilogram (C/kg), and the SI unit for absorbed dose is the gray (Gy). While gammaalayksiköt are no longer standard, understanding them can be helpful when interpreting historical scientific texts or older radiation measurement equipment. Their historical significance lies in their contribution to the early development of nuclear physics and radiation protection.