劳夜光问题

找到一段比较系统的叙述：

“Swiss”
luminous material Radium
used until 1960
radioactive

“Swiss T - < 25”
luminous material Tritium
used from 1960 until 1998
radioactive, radioactivity less than 925 MBq (25 mCi)

“T Swiss T”
luminous material Tritium
used from 1960 until 1998
radioactive, radioactivity less than 277 MBq (7,5 mCi)

“Swiss”
luminous material luminova
used from 1998 until 2000
not radioactive

“Swiss Made”
luminous material Superluminova
used from 2000
not radioactive

T Swiss T 与 Swiss T < 25 其实是共存的，时期由1960使用至1998年
T Swiss T 的氚使用量少很多
Swiss T < 25 的氚使用量达到可允许的最大限度