核反应堆中的长寿命裂变产物核135Cs(T1/2=2.3×106 a)是监测核泄漏的一个非常灵敏的核素,AMS是实现135Cs高灵敏测定的唯一有效的方法。本课题采用CsF、CsNO3等多种样品形式进行了探索。初步实验结果表明:采用CsNO3作为测量样品、离子源引出原子离子Cs-,有利于降低同量异位素135Ba的干扰,提高测量灵敏度(目前测量灵敏度约为10-11)。此方法的建立对于核安全早 The long-lived fission product, nuclear 135Cs (T1 / 2 = 2.3 × 106 a) in nuclear reactors, is a very sensitive nuclide for monitoring nuclear leaks. AMS is the only effective method for achieving 135Cs high sensitivity. The subject using CsF, CsNO3 and other sample forms were explored. The preliminary experimental results show that using CsNO3 as the measurement sample, the ion source leads to the atomic ion Cs-, which is beneficial to reduce the interference of isobaric 135Ba and improve the measurement sensitivity (the current measurement sensitivity is about 10-11). The establishment of this method is nuclear safety early