Abstract
摘 要中子輻射可以利用超熱液滴進行偵檢，這種偵檢器稱為超熱液滴偵檢器或氣泡偵檢器。其偵檢中子輻射的機制及原理經己被研究，甚至製造成偵檢器的技術及電子自動計讀儀亦己研發量產，可是氣泡偵檢器為較新型的產品，其本身有著許多持性可供進一步的探討。本研究通過一系列的校正及實際的量測，對氣泡偵檢器的特性有一詳盡的探討。其靈敏度校正後約為每1000nSv產生2~4氣泡，並通過實地現場量測THOR爐房內的中子劑量率驗証了氣泡偵檢器可有效的監測核設施內的中子劑量，在21.5小時的有效測量時間內可計讀之偵測極限為12nSv(hr-1。在飛機座艙中對高空飛行人員進行宇宙中子輻射劑量的量測，更顯出氣泡偵檢器攜帶及操作上的方便性。氣泡偵器在測量時因不與加馬射線作用，可直接瞬時計讀、具有與ICRP等效劑量曲線相似之回應等特性，因此可直接量測人員中子劑量。AbstractNeutron can be detected on the basis of suspension thesuperheated drops in polymer or gel mixture. The mechanism ofradiation induced bubble nucleation has been studied. Atechnique of generating uniform sized superheated dropssuspended in a viscous liquid has been commercially developed.Autoreader has been designed and tested to detect bubbles in thepolymer.Because the bubble detector is a of detecting device, it hasmany characteristics which can be further studied. Thisexperimental work not only calibrates bubble detector andstudies it's characteristics, but also makes in situ measurementin the THOR (Tsing Hua Open-pool Reactor) facility and monitorthe in-flight neutron dose in aircraft. In an 21.5 hoursmeasurement period, one can get a detection limit equivalent toa neutron dose rate of 12nSv(hr-1. Moreover, bubble detector isinsensitive to gamma rayvisually readable, and has a doseequivalent response function close to the ICRP curve.