Heitler unit – Russian translation

радиационная длина (especially in theory of electron-photon showers); каскадная длина (especially in theory of electron-photon showers); лавинная длина (especially in theory of electron-photon showers); радиационная единица (especially in theory of electron-photon showers); каскадная единица (especially in theory of electron-photon showers); лавинная единица (especially in theory of electron-photon showers); гайтлеровская единица (especially in theory of electron-photon showers, длины)