A Study on the Preparation of Tritium Luminous Compound

트리티움 표지 형광도료의 원료인 고 비방사능의 트리티움 표지 폴리스타이렌을 얻기 위하여 테슬라 방전법, 윌즈바크 노출법, 감마선 조사법, 자외선 조사법 등 여러 방법들을 비교 검토하였다. 테슬라 방전 또는 자외선 조사법으로 얻은 polystyrene-T(G)의 비방사능은 1-l.2mCi/mg로써 다른 방법에 의한 생성물의 값보다 높았다. Polystyrene-T(G)와 ZnS:Cu 형광체를 무게비로 1:4가 되게 혼합하면 광도가 가장 컸다. 30mg의 형광도료 혼합물을 1ml의 바인다(시판 니스 1g을 100m1의 벤젠에 녹인 것)를 써서 바르는 경우 최대 장도는 약 20$\mu$L이었으며 갱내 표지판이나 암실내 광원으로 유효하게 사용될 수 있음을 확인하였다.

For the syntheses of tritium labelled polystyrene, the basic material for the preparation of tritium luminous compound, various methods of labelling such as Tesla discharge, Wilzbach exposure, gamma irradiation, and U V. irradiation were compared in view of getting high specific activity-product. The obtained polystyrene-T(G) by the method of Tesla discharge and by the method of U. V. irradiation had specific activity of 1～1.2 mCi/mg, and these two methods were the most encouraging. Mixing of 1 part of polystyrene-T(G) with 4 parts of ZnS:Cu phosphor, in weight, appeared to be the most suitable ratio in tile preparation of luminous compound in luminosity point of view. When 30 mg. of obtained luminescent mixture was applied on steel plate by using 1 ml. of the selected binder (i.e., 1g of commercial varnish in 100m1. of benzene) the luminosity maximum was ca. 20 micro Lambert. The prepared luminous compound was confirmed to be practically applicable for mine marker or dark-room light source.