radiation equilibrium

...(1) A state in which thermal equilibrium exists between an object and radiation in a cavity that is thermally insulated from the outside world (radiative equilibrium). Thermal radiation (2) A state in which the total amount of energy of all electromagnetic waves, such as light and X-rays, flowing into a unit volume of an object from the outside is equal to the total amount of energy of all electromagnetic waves going out, that is, a state in which the flow in and out is in balance (radiative equilibrium or radiation equilibrium). When there is an outflow of energy inside an object due to nuclear reactions, etc., the amount of energy outflow is added to the amount of energy inflow to consider equilibrium. ...

*Some of the terminology that mentions "radiation equilibrium" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…(1)外界と熱的に絶縁された空洞において，その中の物体と放射の間に熱平衡が成り立っている状態をいう(radiative equilibrium)。熱放射(2)物体の単位体積に外から流入する光，X線などすべての電磁波と，外へ出て行くすべての電磁波とを比較し，それぞれのエネルギーの総量が相等しいような状態，つまり出入りが平衡している状態をいう(radiative equilibriumまたはradiation equilibrium)。物体の内部で原子核反応などによるエネルギーの湧出がある場合には，その湧出量を流入量に加えて平衡を考える。…

※「radiation equilibrium」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報