noun
irradiation field; radiation field
Technical term used in radiology and radiotherapy to describe the area exposed to X-rays or other radiation.
治療計画では、照射野を正確に設定することが重要です。
In treatment planning, it is important to set the irradiation field accurately.
Compound of 照射 (irradiation) and 野 (field). The exact historical derivation is uncertain; the term is a modern technical coinage.