radioactive source

By this method, the spatiotemporal distribution of radioactive nuclides in atmosphere in different terrain characteristics, different weather situations for instantaneous or continuous leaking source were obtained, and the dry or wet deposition quantities on the ground were also acquired.

该方法可计算核事故中连续点源和瞬时点源在不同气象、地形条件下的浓度分布，并可获得地面的干沉积率和湿沉积率。

Away from high-temperature source and radioactive sources to avoid acids, alkalis, oils and sharp materials placed.

给挨近矮温、热源及不收射源,制止与酸 、 碱 、 油类和不团软精神等一路不领取.

Integrated geophysical investigation to the chamber stored radioactive materials source

废弃放射源贮存池的综合地球物理勘查

The activity of the large area source is 22. 2 GBq and the deposition efficency of 63Ni is over 96%. The radioactive material 63Ni is uniformly distributed on the copper matrix and the nonuniformity is less than 5%.

制备的63Ni低能β放射源活度高达22.2GBq，63Ni的沉积率＞96%，放射源的不均匀度＜5%。

Using coincidence method, transit time spread ( TTS) is measured with Cherenkov light produced by cascade γ radioactive source, 60Co on photocathode window of photomultiplier tube ( PMT).

采用符合方法，测量级联γ放射源60Co在光电倍增管（PMT）光阴极窗上激发产生的切伦科夫光，从而测定PMT渡越时间涨落。