" derived intervention levels " are introduced as measurable quantities estimated from the corresponding intervention levels . they can be compared directly with radiation monitoring results and referenced in the consideration of necessary countermeasures 导出干预水平就是按照干预水平推算的一些可以与辐射监测数据直接比较的指标，供决策者在考虑采取防护措施时参考。
In simple terms , the level of measured or predicted dose at which a particular countermeasure i . e . intervention during a nuclear accident should be introduced is known as the " intervention level " . countermeasures , which always involve costs and risks , should be 简单来说，当监测到或预计剂量达到某一水平时，便需采取相应防护措施即在核事故时的干预措施，这个剂量水平称为干预水平。
Have different derived intervention levels , which can be in the form of external gamma dose rate , time integral of radionuclide concentration in air , ground deposition of radionuclides and concentration of radionuclides in foodstuffs or drinking water 有其相应的导出干预水平，分别可以表示为外照射剂量率空气中放射性核素的积分活度浓度放射性核素在地面的沉积密度及放射性核素在食水和食物中的活度浓度。
Have different derived intervention levels , which can be in the form of external gamma dose rate , time integral of radionuclide concentration in air , ground deposition of radionuclides and concentration of radionuclides in foodstuffs or drinking water 有其相应的导出干预水平，分别可以表示为外照射剂量率、空气中放射性核素的积分活度浓度、放射性核素在地面的沉积密度及放射性核素在食水和食物中的活度浓度。
