放射性示踪器 meaning in Chinese

radioactive inaicator
radioactive tracer

Measurement of water flow in closed conduits . tracer methods . part vii : transit time method using radioactive tracers
密封管道中水流量的测量.示踪法.第7部分：放射性示踪器的跃迁时间法
Measurement of water flow rate in closed conduits . tracer methods . part iii : constant rate injection method using radioactive tracers
密封管道中水流速的测定.示踪法.第3部分：放射性示踪器恒流速喷射法