In this paper

MgSO

4

:Dy

MgSO

4

:Tm and MgSO

4

:Mn phosphors are prepared by high temperature solid state reaction.The MgSO

4

:Dy and MgSO

4

:Tm are mixed and sintered with MgSO

4

:Mn to obtain MgSO

4

:Dy

Mn and MgSO

4

:Tm

Mn co-doped TL dosimeters.The TL spectra show that Dy

Tm and Mn ions glow independently at sintering temperature of 700°C.At sintering temperatures of over 800°C

the glow peak of Mn becomes weak

but the high temperature peaks of Dy and Tm become strong.These indicate that the formation of TL defect complex depends on the sintering temperature.At higher sintering temperatures

more Mn ions are combined with the rare earth ions

therefore

we can observe clearly the luminescence processes of the energy transfer of Mn ions to the rare earth ions and the suppression to low temperature peaks of Tm and Dy.