Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
선량계는 방사선 노출을 측정하는 데 사용됩니다.seonryang-gye-neun bangsaseon nochul-eul cheugjeonghaneun de sayongdoemnida.A dosimeter is used to measure radiation exposure.