Dihydroxyurea (DHU) is a new salt-free reducing agent applied for the separation of Pu and Np from U in spent fuel reprocessing. This paper reports on the γ-ray radiolysis of DHU in HNO₃ and its radiolytic products. DHU is relatively stable against radiation at the dose supposed to be absorbed in the separation of Pu and Np from U. The main radiolytic products are H₂, CO₂, N₂O and \({\text{NH}}_{{4}}^{ + }\). The volume fraction of H₂ increases with the dose, but decreases with increasing HNO₃ concentration. The quantity of CO₂, N₂O and \({\text{NH}}_{{4}}^{ + }\) increases with the HNO₃ concentration and the dose.

二羟基脲（DHU）是一种新型无盐还原剂，适用于乏燃料后处理中从铀中分离出钚、氮磷。本文报道了 DHU 在 HNO ₃中的 γ 射线辐解及其辐解产物。DHU 在从 U 中分离出 Pu 和 Np 的吸收剂量下对辐射相对稳定。主要的辐射分解产物是 H ₂、CO ₂、N ₂ O 和\({\text{NH}}_{{ 4}}^{ + }\)。H ₂的体积分数随着剂量的增加而增加，但随着HNO ₃浓度的增加而减少。CO ₂、N ₂ O 和\({\text{NH}}_{{4}}^{ + }\)的数量随 HNO ₃浓度和剂量的增加而增加。