LSPBⅠ、Ⅱ是由重庆大学研制的新型有机液态闪烁体,它的主要技术指标与国内外通用的LS_(二甲苯)一致,但它具有闪点高、挥发性低、毒性小、温度效应好、性能稳定和资源丰富等特点。LSPBⅠ、Ⅱ特别适宜于测量低能β射线,能用于生物学、医学以及农业等等。本文报导了LSPBⅠ、Ⅱ的性能及其在核医学中历时三年的临床应用。实验证明它的临床应用效果较好。LSPBⅠ、Ⅱ是目前替代LS_(二甲苯)的一种较为理想的闪烁液。 LSPBⅠ, Ⅱ is a new type of organic liquid scintillator developed by Chongqing University. Its main technical indexes are consistent with LS_ (xylene), which is widely used at home and abroad. However, it has the characteristics of high flash point, low volatility, low toxicity, good temperature effect, Stable performance and rich resources. LSPB I, II is particularly suitable for measuring low-energy beta rays, can be used in biology, medicine and agriculture and so on. This paper reports the performance of LSPB I and II and their clinical application in nuclear medicine for three years. Experiments show that its clinical effect is better. LSPBⅠ, Ⅱ is a more ideal scintillation fluid instead of LS_ (xylene).