| 1. | The daughter nuclides of radon and thoron tend to become attached .
氡和钍射气的子体易被气溶胶吸附。 |
| 2. | Measurements of thoron concentration and dose assessment
浓度的测量及剂量学评价 |
| 3. | Study on the activated charcoal monitor for thoron in air
空气中钍射气活性炭收集器的研究 |
| 4. | 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
下面简要介绍研究的简易(气土)室、测量方法、剂量估算方法和它们的初步应用。 |
| 5. | 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
简易(气土)室由(气土)积累箱、充源循环回路、积累箱中(气土)水平标定回路三部分组成。 |
| 6. | 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
近年来，有关环境(气土)水平调查的兴趣呈现明显上升趋势，发现环境中高(气土)浓度存在的调查结果较多。 |
| 7. | 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
用有机玻璃制成(气土)积累箱，尺寸为350mm 250mm 180mm ，在250mm 180mm的两个侧面上打了五个孔，用于充源或取样。 |
| 8. | 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
研究被动积分测(气土)技术的关键在于研究用于条件实验和刻度的(气土)室刻度系统、甄别氡的方法和由(气土)暴露量估算(气土)子体所致有效剂量的方法。 |
| 9. | 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
简易(气土)室采用加拿大pylon公司生产的th - 1025型流气式固体(气土)源， (气土)进入积累箱之前先与循环气流混合，积累箱中的(气土)浓度可以通过改变流经(气土)源的气流流率或在充源回路加不同体积的延迟瓶加以调节。 |
| 10. | 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
虽然(气土)是氡的同位素，它及其子体的特性也与氡及其子体的相似，但由于(气土)的半衰期短( 55 6s ) ，环境中(气土)浓度较低， (气土)及其子体浓度的测量较难，人们一般认为(气土)及其子体所致剂量可以忽略，所以对环境中(气土)及其子体剂量评价研究很少。 |
