钍系

不平衡铀系和钍系核素的γ谱测定

Measurement of nuclides of uranium and thorium series of disequilibrium using γ - spectroscopy

不平衡钍系的放射性计算

Calculation of the radioactivity of non-equilibrium thorium series

本文叙述了用厚源α计数技术测定TL和ESR年代中钍系和铀系年剂量的原理和方法。

The thick source alpha counting in TL and ESR dating is described .

采用MCNP模拟软件和水分对天然伽玛射线的影响实验，对不同水分土壤中铀系和钍系天然伽玛的原始谱进行了模拟运算。

The original spectrum from the soil is simulated by MCNP and the experiment of influence to natural gamma-ray is done .

用NaI（Tl）γ谱仪测定地层铀系、钍系和钾&40γ照射量率的逆矩阵法

A inverse matrix method for measuring individual exposure rate from ~ ( 238 ) u series , ~ ( 232 ) th series and ~ ( 40 ) k of environmental gamma radiation by a (?) 100 × 100 nai ( tl )γ spectrometer

土壤中水分含量对铀系、钍系天然γ能谱影响的分析

Effect of moisture in soils on natural gamma spectrum of uranium-series and thorium-series

在稀土矿物在加工利用中，原矿、精矿和选矿尾矿中，放射性钍系基本处于放射性平衡状态，但在稀土产品、富集物、富铈渣和冶炼废渣中，钍系处于非放射性状态。

In the processing and utilization of rare-earth minerals , radioactive thorium series is in radioactive equilibrium basic state in raw ore , concentrate and mineral processing tailings , but in the rare earth products , enrichment , Ce-rich slag and smelting waste , the thorium series is non-radioactive state .

调查分析了我国3个典型矿区锆英砂堆放表面γ剂量、放射性比活度、铀系和钍系平衡状况以及放射性元素含量；测定了我国海南万宁矿区锆英砂的组成及放射性。

In this survey , the surface γ dosage , radioactivity specific activity , uranium and thorium series equilibrium , the content of radioactive element of three kinds of typical Chinese zircon mineral has been analyzed , and the component and radioactivity of zircon in Wanning , Hainan Province tested .

PMBP络合物中铀、钍及镧系离子对振动光谱的影响

Effect of uranium , thorium and lanthanide ions in PMBP complexes on vibrational spectra

由于铀，钍、锕三系能直接发射微量重离子~（14）C，以及自发裂变中子和α-衰变与物质发生核相互作用，也可产生~（14）C。

Heavy-ion 14 ~ C can not only be directly emitted by three radioactive series ( 238 ~ U , 235 ~ U and 232 ~ Th ), but can also be produced by neutrons of the spontaneous fission and α - decay interacting with matter .