[en] A study on the fabrication of a new personal thermo-luminescence dosimeter, which can evaluate the personal dose equivalent H_p(d), has been performed. Optimum conditions for fabrications of a LiF:Mg, Cu, Na, Si TL phosphor powder has been determined and a disc type TL pellet has been fabricated from this TL powder. Another type of CaSO₄:Dy, Mo TL material has been also fabricated. These two TL materials have shown greater TL sensitivity than the foreign-made commercial TL materials. Mono-energetic florescence X-rays from 8.6 response have been constructed and evaluated for the performance of the purity, air kerma, beam uniformity and distribution,and scattered fraction of X-rays. A free-air ionization chamber for the absolute measurement of air kerma in medium X-ray has been designed and constructed. Experimental results showed that the homemade chamber leaves nothing to be desired, compared with the national standard chambers in other advanced countries. Gas proportional counting system has been designed and constructed for absolute activity measurements of gaseous radionuclides. Unattached fractions of radon progeny were evaluated in the characteristic study on the detection of radon progeny