Alpha spectrometric characterization of thin $^{233}$U sources for $^{229\text{(m)}}$Th production

为α粒子和γ射线能谱法定制放射性核素库的计算生成

Computational generation of tailored radionuclide libraries for alpha-particle and gamma-ray spectrometry

针对传统放射性核素识别系统中库手动构建耗时易错、难以定制的问题，提出自动生成定制库的计算算法及RecurLib软件架构，通过母核-子核递推关系递归计算核素子集，经多样本验证高效，简化识别并促进未注册核素识别。

α粒子激发下四苯基丁二烯薄膜的闪烁

Scintillation of thin tetraphenyl butadiene films under alpha particle excitation

为了提高对DEAP暗物质搜寻实验中可能的表面α背景的认识，研究了波长移动体1，1，4，4-四苯基-1，3-丁二烯（TPB）的α诱导闪烁.我们发现真空沉积的TPB薄膜在α粒子激发下每MeV发射882 +/-210个光子。闪烁脉冲波形由双指数衰减组成，寿命为11 +/-5 ns和275 +/-10 ns。

Characterization of $^{233}$U alpha recoil sources for $^{229(m)}$Th beam production

Radioactive $^{233}$U alpha recoil sources are being considered for the production of a thorium ion source to study the low-energy isomer in $^{229}$Th with high-resolution collinear laser spectroscopy at the IGISOL facility of the University of Jyväskylä. In this work two different $^{233}$U sources have been characterized via alpha and gamma spectroscopy of the decay radiation obtained directly from the sources and from alpha-recoils embedded in implantation foils. These measurements revealed rather low $^{229}$Th recoil efficiencies of only a few percent. Although the low efficiency of one …

On the Analytic Estimation of Radioactive Contamination from Degraded Alphas

The high energy spectrum of alpha particles emitted from a single isotope uniformly contaminating a bulk solid has a flat energy spectrum with a high end cutoff energy equal to the maximal alpha kinetic energy ($T_α$) of the decay. In this flat region of the spectrum, we show the surface rate $r_b\text{\,(Bq/keV-cm}^{2})$ arising from a bulk alpha contamination $ρ_b$ (Bq/cm$^3$) from a single isotope is given by $r_b =ρ_b ΔR/ 4 ΔE $, where $ΔE = E_1-E_2>0\ $ is the energy interval considered (keV) in the flat region of the spectrum and $ΔR = R_2-R_1$, where $R_2$ ($R_1$) is the amount of the b…