Release rate of ¹³¹I and the amount of ¹³¹I remaining in the salt under different redox conditions.

Molten salt system	Additives (mg)	Release rate of 131I	Ratio of activities
			131I/140Ba	131I/143Ce	131I/95Zr
UF4	—	—	0.83	0.41	3.56
UF4 + FLiBe	—	54.7%	0.40	0.17	1.82
UF4 + FLiBe	Li (20 mg)	23.1%	0.61	—a	2.43
UF4 + FLiBe	CeF4 (20 mg)	87.2%	0.106	0.035	0.444

^aNo corresponding experimental data were obtained due to the short half-life of ¹⁴³Ce.