IPA: /ˌreɪdiəˈmɛtrɪkli/
KK: /reɪdiəˈmɛtrɪkli/
In a way that relates to the measurement of radiation, often used in scientific contexts.
The samples were analyzed radiometrically to determine their age.
Radiometrically → It is formed from "radio-" (from Latin "radius", meaning ray) and "metric" (from Greek "metron", meaning measure) and the suffix "-ally" (meaning in a manner). The word refers to measuring radiation or rays in a specific manner.
Think of 'rays' ('radio-') being 'measured' ('metric') in a certain way ('-ally'). This helps you remember that 'radiometrically' relates to the measurement of rays or radiation.