分支
氡及子体活度计量技术/ metrology technology for radon nuclides and their decay products // metrology technology for radon nuclides and their decay products /
常温下为气态的222Rn、220Rn核素活度的绝对测量,以及222Rn、220Rn的衰变子体的单位体积活度的绝对测量。