Laboratuvarda radyasyon ölçümü yapılıyor.

Radiation is being measured in the laboratory.

Breakdown of Laboratuvarda radyasyon ölçümü yapılıyor.

• laboratuvar: the laboratory
• -da: in
• radyasyon: radiation
• ölçülmek: to be measured

Questions & Answers about Laboratuvarda radyasyon ölçümü yapılıyor.

What is the function of -da in Laboratuvarda, and why is it -da and not -de?

-da is the locative case suffix, equivalent to English “in,” “on,” or “at.” It attaches directly to the noun:
laboratuvar + da → Laboratuvarda (“in the laboratory”)
Vowel harmony dictates -da (back vowel variant) because the last vowel in laboratuvar is a (a back vowel). If the noun ended in a front vowel (e.g. şehir), we would use -de: şehirde (“in the city”).

Why is Laboratuvarda written as one word rather than two?

In Turkish, case and possessive suffixes attach directly to the noun without spacing. So the locative -da is appended directly to laboratuvar, forming a single word.

What does radyasyon ölçümü mean, and why isn’t ölçüm marked for case here?

radyasyon ölçümü is a compound noun meaning “radiation measurement.” In compounds, the first element (radyasyon) modifies the second (ölçüm) without any linking vowel or case marking on radyasyon.
Moreover, in this passive construction, the original object becomes the new subject and takes no accusative suffix. Thus ölçüm stays in its base form (nominative), not ölçümü with accusative.

How do we interpret yapılıyor in this sentence?