用铥（或镝）激活的硫酸钙——CaSO

4

:Tm（或镝）热释光剂量计（简称TLD）在γ射线的低能范围（

<

200keV）有较大的能量响应，是一种制备和实用都很方便的磷光体，但要用它测量β射线的吸收剂量，必须将其制成厚约20μm左右的超薄元件。我们用CaSO

4

:Tm测定γ和X射线的剂量以后，就着手于超薄型元件的制作，并对它的应用也做出了初步探讨。元件的制作是将粒度1~8μm的CaSO

4

:Tm粒末均匀地沉积在银托片上，然后加粘结剂烧结而成。这种元件经反复使用不会脱落，它可用于测定

β

照射的吸收剂量。

This paper describes the preparation of the ultrathin TLD (thermoluminescent detector) element by depositing CaSO

4

:Tm onto a silver disc. The method described includes the chosing of 1~8µm CaSO

4

:Tm grains and the shaping sintering of 5~10µm CaSO

4

:Tm samples. Some of the dosimetry properties of the TLD element are given too. And a method of using the element to measure the dose absorbed by a matter irradiated by

β

-rays is proposed.

Finally

some problems found in application are discussed. The conclusion is that according to the exposure of γ-rays

the TLD element can be used to measure relatively the dose absorbed by a matter irradiated by

β

-rays of an average energy between 0.2 and 0.9 MeV with deviation of ±10%.