Characterization of the homogeneity of thin actinide deposits prior to and after irradiation is important to ensure measurement of high-quality nuclear data in nuclear physics experiments. Autoradiography is frequently used to assess homogeneity, but geometric blur from source thickness, particle range, and source-detector gap can significantly degrade image resolution and introduce bias when estimating source uniformity and activity. We establish a method for minimizing geometric blur using a new autoradiography imaging technique with microcapillary array collimators and a new method to characterize the homogeneity of an imaged deposit. Also, we demonstrate that beta-/gamma-blind imaging is possible for alpha-particle autoradiography with ZnS:Ag scintillators and the ionizing-radiation quantum imaging detector (iQID), a digital autoradiography system with intrinsic spatial resolutions up to 20 μm for alphas. This iQID imaging approach can successfully discriminate alphas in the presence of a beta-gamma source in samples containing >10⁶ dynamic range in activity. We apply this feature to characterize the uniformity of plutonium deposits before and after accelerator irradiation in the presence of a large beta-gamma background.

辐照前后act系稀薄沉积物的均质性表征对于确保核物理实验中高质量核数据的测量非常重要。放射自显影通常用于评估均匀性，但是在估算放射源的均匀性和活动性时，放射源厚度，粒子范围和放射源-检测器间隙的几何模糊会显着降低图像分辨率并引入偏差。我们建立了一种使用带有微毛细管阵列准直仪的新放射自显影技术和一种新方法来最小化几何模糊的方法，该新技术可表征成像沉积物的均匀性。此外，我们证明了使用ZnS：Ag闪烁体和电离辐射量子成像探测器（iQID）进行α粒子放射自显影时，β-/γ盲成像是可能的，数字自动放射成像系统，其固有空间分辨率高达20微米（对于alpha）。这种iQID成像方法可以成功地在包含> 10的样本中存在β-γ源的情况下成功区分出alpha⁶动态范围内的活动。我们应用此功能来表征在存在较大的β-γ背景的情况下促进剂辐照前后deposit沉积的均匀性。