磁流体动力学电沉积法制备241Am α放射源

针对目前核电站安全运行实时监测中对高分辨率²⁴¹Am作为稳峰源的需求，建立了一种高分辨率α放射源制备方法--磁流体动力学电沉积法，并设计了磁流体动力学电沉积法制备放射源的装置和流程。以²⁴¹Am为研究对象，对磁流体动力学电沉积法制备放射源的工艺条件进行了优化选择：在沉积槽单侧施加磁场使沉积源片中心处的磁感应强度B=0.193 T、(NH₄)₂SO₄电解液浓度0.5 mol/L、电流密度180 mA/cm²、沉积液pH=2.0～2.5、电极间距5 mm、沉积时间1 h。结果显示，²⁴¹Am可定量沉积在不锈钢阴极源片上，沉积效率近100%，且所制源的能量分辨率较不加磁场时提高了15.0%。所制源的牢固性和均匀性检验结果表明，磁流体动力学电沉积法所制备的²⁴¹Am α放射源的牢固性和均匀性均良好。

Preparation of Alpha Source for 241Am by Magnetohydrodynamic Electrodeposition Method

In order to offer the high resolution ²⁴¹Am alpha source used in the real-time monitoring of nuclear power plant safety operation, the magnetohydrodynamic electrodeposition method was built, and the equipment and processes were designed. The ²⁴¹Am sources were prepared by this method, and the deposition conditions were optimized. The optimal deposition conditions are as follows: (NH₄)₂SO₄ concentration is 0.5 mol/L as deposition solution, the current density is 180 mA/cm², the distance between platinum anode and stainless steel cathode is 5 mm, the magnetic induction at the center of the source slice is 0.193 T, pH of deposition solution is 2.0-2.5, and the deposition time is 1 h. The results show that ²⁴¹Am can be deposited quantitatively on the cathode, the deposition yield is nearly to 100%, and the energy resolution is 15.0% higher than that without the magnetic field. The uniformity and firnmess of ²⁴¹Am sources were inspected, and the results show that the uniformity and firnmess of the sources prepared by the magnetohydrodynamic electrodeposition method are both good.