kaugus röntgentoru fookusest (või kiirgusallikast) pildiretseptorini (film, fosfoorplaat, täisdigitaalplaat); kiirguse intensiivsus on pöördruutsõltuv kaugusest punktallikani (millena röntgentoru efektiivne fookustäpp on suurte fookuskauguste korral enamasti tõlgendatav)

a designated instrument flight rule (IFR) departure route linking the aerodrome or a specified runway of the aerodrome with a specified significant point, normally on a designated ATS route, at which the en-route phase of a flight commences

a designated instrument flight rule (IFR) departure route linking the aerodrome or a specified runway of the aerodrome with a specified significant point, normally on a designated ATS route, at which the en-route phase of a flight commences