Two special TL phenomena have been found in Yanzhuang meteorite through the determination of the natural TL

annealed TL and induced TL by β radiation: l.when the sample of Yanzhuang meteorite is annealed at temperature up to 500℃

the TL peak induced by β rays moves to lower temperature with the increasing of irradiation dose; 2.when the annealed temperature is greater than 600℃

the TL peak temperature of the annealed sample is higher than that of the unannealed sample. Yanzhuang meteorite is composed of black and light parts. The equivalent β dose for the two parts are 9238 Gy and 25753 Gy respectively .showing that the thermal events age for the two parts in the meteorite is not equal

and their thermal histories are not the same

either.