The disclosure concerns a pellet type LiF element for a thermoluminescent dosimetry (TLD) and its preparation. More particularly, the disclosure concerns the pellet type LiF element for a thermoluminescent dosimetry (TLD) which includes 0.35~0.12% by mole of Mg source; 0.08~0.001% by mole of Cu source; 1.3~0.5% by mole of Na source; and 1.3~0.5% by mole of Si source as dopants. The pellet type LiF element according to the present invention shows excellent sensitivity and has the preferred glow curve with a simple and single main peak.
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