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題 名 | 新馬可夫測氡法=New Markov Method for Radon Measurment |
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作 者 | 田德源; 陸治釗; | 書刊名 | 核子科學 |
卷 期 | 34:1 1997.02[民86.02] |
頁 次 | 頁60-64 |
分類號 | 449.6 |
關鍵詞 | 氡短壽命子核; 總广計數法; 總β計數法; Short-lived radon decay products; Gross alpha-counting method; Gross beta-counting method; |
語 文 | 中文(Chinese) |
中文摘要 | 本文從氡及其子核衰變規律出發,根據取樣期間的初始條件和測量期間的邊界條件解Bateman方程,以及各種情況下空氣中氡子核濃度比近似滿足1:0.6:0.4的規津,詳細推導馬可夫法測量待測空氣中各個氡短壽命子核濃度的計算公式。文中提供用SI單位表示的馬可夫法公式;引入美國國家輻射防護委員會(NCRP)關於計算平衡當量氡濃度的公式,從而實現了氡及其子核快速聯合監測。此外,根據誤差合成規則還提供了只考慮計數統計誤差時,計算濃度合成不確定度的公式。長期以來氡子核偵測都是借助於總α計數法,無人問津總β計數法。隨著科學技術的發展,目前國內外β、甚至低背景β測量儀器已相當普及,這為採用總β計數法提供了方便。本文提出使用後者的新馬可夫測氡法,提供一套完整的公式以饗讀者。 |
英文摘要 | The formula of Markov method for calculating radon and its short-lived decay products concentrations in measured air by means of gross α-counting method is given in detail based on the initial and boundary conditions to solve Bateman equation from radioactive decay law. The formula for EECRn and concentration ratio of 1:0.6:0.4 were used to monitor radon and its progeny in air. Up to the present, radon and its daughters in air are usually monitored by means of gross α-counting detection. But radon daughters, which include RaB and, RaC, are the β and γ emitters, and they contribute about 90% to the equilibrium equivalent radon concentration. They can also be measured by gross β-counting method. The lower background β (even low level β) instruments have been availible internationally and domestically now. Therefore, the new Markov method by gross β measurement can be used. |
本系統中英文摘要資訊取自各篇刊載內容。