T - K英文單字3000 - thoron 中文 - EN166

thoron n.【化學】釷射氣(略Tn)〔射氣同位素，Em222。

thorough
The developments of passive and integrated thoron measurement methods and effective dose evaluation methods of thoron progeny are of important significance to compensate the shortage of studies on the evaluation methods of thoron and thoron daughters in environment , meet the technical needs of representative , comparability , reliability to the measurement results of the monitoring methods in the environmental evaluation , measure and evaluate usually thoron level in environment , protect ecological environment , ensure public health , and so on 發展被動積分測(氣土)方法及(氣土)子體所致有效劑量估算方法，對彌補環境(氣土)及其子體評價方法研究的不足，滿足環境評價對監測方法測量結果的代表性、可比性、可靠性等的技術要求，進行環境中氡(氣土)水平經常性監測與評價，保護生態環境、保障公眾健康具有十分重要的意義。
Although thoron is one of isotopes of radon , and the characteristics of thoron and thoron progenies are similar to those of radon and radon progenies , because the half life of thoron is shorter ( 55 . 6s ) , the concentrations of thoron and thoron daughters in environment are lower , people usually think that the effective dose from thoron and its progenies can be eliminated , and the measurements of thoron progenies concentrations are difficulty , a little research work on the dose evaluation of thoron and thoron progenies in environment has been done 雖然(氣土)是氡的同位素，它及其子體的特性也與氡及其子體的相似，但由于(氣土)的半衰期短( 55 6s ) ，環境中(氣土)濃度較低， (氣土)及其子體濃度的測量較難，人們一般認為(氣土)及其子體所致劑量可以忽略，所以對環境中(氣土)及其子體劑量評價研究很少。
A th - 1025 thoron source made in pylon company of canada was adopted . thoron gas is mixed with circulation gas before they are input into the thoron accumulation box . the thoron level in the thoron accumulation box can be adjusted by changing the gas flow rate through the thoron source , or adding different volume of delay boxes in source input circuit , and me 簡易(氣土)室采用加拿大pylon公司生產的th - 1025型流氣式固體(氣土)源， (氣土)進入積累箱之前先與循環氣流混合，積累箱中的(氣土)濃度可以通過改變流經(氣土)源的氣流流率或在充源回路加不同體積的延遲瓶加以調節。
The key problems on studies of passive and integrated thoron monitoring methods are to set up a thoron chamber for the conditional experiments and the calibration of thoron dosimeters , develop methods for discriminating thoron from radon and for the effective dose evaluation of thoron daughters base on thoron exposure 研究被動積分測(氣土)技術的關鍵在于研究用于條件實驗和刻度的(氣土)室刻度系統、甄別氡的方法和由(氣土)暴露量估算(氣土)子體所致有效劑量的方法。
The thoron chamber with the size of 350mm x 250mm x 180mm was made of the perspex . five holes were drilled on the two side with the size of 2 50mm xi 80mm for thoron source input or sampling 用有機玻璃制成(氣土)積累箱，尺寸為350mm 250mm 180mm ，在250mm 180mm的兩個側面上打了五個孔，用于充源或取樣。
In recent years , more and more people pay attention to the investigation of thoron level in environment , the measured results indicate that there are a lot of regions with higher thoron concentrations 近年來，有關環境(氣土)水平調查的興趣呈現明顯上升趨勢，發現環境中高(氣土)濃度存在的調查結果較多。
The simple thoron chamber consists of three parts , they are the thoron accumulation box , the circuit of thoron source input and gas circulation , the circuit of thoron level measurement in the thoron accumulation box 簡易(氣土)室由(氣土)積累箱、充源循環回路、積累箱中(氣土)水平標定回路三部分組成。
A simple thoron chamber , the measurement methods , the effective dose evaluation method of thoron daughters and their primary applications studied are described simply as the followings 下面簡要介紹研究的簡易(氣土)室、測量方法、劑量估算方法和它們的初步應用。
Study on the activated charcoal monitor for thoron in air 空氣中釷射氣活性炭收集器的研究
Measurements of thoron concentration and dose assessment 濃度的測量及劑量學評價
The daughter nuclides of radon and thoron tend to become attached . 氡和釷射氣的子體易被氣溶膠吸附。