The fluoride salt-cooled high-temperature reactor(FHR) uses molten FLi Be salt as the coolant, which introduces a corrosive effect on the alloy-N structure material. Fission neutrons activate the corroded alloy-N,along with alloy-N structures inside the reactor vessel. The activation products of the alloy-N have a big impact on radiation protection during operation, maintenance, and decommissioning of the reactor. We have constructed a SCALE 6.1 model for the core of a typical 10 MW th FHR and analyzed the activity of each constituent of the irradiated alloy-N. The results show that the activity is predominantly due to short-lived~(28) Al,~(60m) Co,~(56) Mn,~(51)Ti, and ~(52) V, as well as long-lived ~(60) Co,~(51)Cr,~(55)Fe,~(59)Fe, and ~(54) Mn.Furthermore, because of their relatively long half-life and high-energy c-rays emissions,~(60) Co and ~(54)Mn are the major contributors to the radiation source terms introduced by alloy-N activation. The yield of ~(60)Co and ~(54)Mn per unit mass of alloy-N under the current core design is 5.58*10~5 and 1.55 * 10~3 Bq MWd~(-1)g~(-1), respectively.The results of this paper, combined with future corrosion studies, may provide a basis for evaluating long-term radiation source terms of the primary loop salt and components. The fluoride salt-cooled high-temperature reactor (FHR) uses molten FLi Be salt as the coolant, which introduces a corrosive effect on the alloy-N structure material. Fission neutrons activate the corroded alloy-N, along with alloy-N structures inside the reactor vessels. The activation products of the alloy-N have a big impact on radiation protection during operation, maintenance, and decommissioning of the reactor. We have constructed a SCALE 6.1 model for the core of a typical 10 MW th FHR and analyzed the activity of each constituent of the irradiated alloy-N. The results show that the activity is predominantly due to short-lived ~ (28) Al, ~ (60m) Co, ~ (52) Cr, ~ (55) Fe, ~ (59) Fe, and ~ (54) Mn.Furthermore, because of their relatively long half -life and high-energy c-ray emissions, ~ (60) Co and ~ (54) Mn are the major contributors to the radiation source terms introduced by alloy-N activation. ) Mn per unit mass of alloy-N under the current core design is 5.58 * 10 ~ 5 and 1.55 * 10 ~ 3 Bq MWd ~ (-1) g ~ (-1), respectively.The results of this paper, combined with future corrosion studies, may provide a basis for evaluating long-term radiation source terms of the primary loop salt and components.