be on speaking terms

be obedient to be objective to be obliged to be obliged to do sth be obliged to sb be oblivious of be oblivious to be obscured by be obsequious to be obsessed with be occupied in be occupied with

radioactive flowmeter radioactive gallium radioactive gold radioactive half-life radioactive hydrogen radioactive inaicator radioactive indicator radioactive iodine excretion test radioactive iodine test radioactive iodine uptake test