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公开(公告)号：US5311025A
公开(公告)日：1994-05-10
申请号：US933143
申请日：1992-08-21
CPC分类号： G01T1/178
摘要： A fan-less long range alpha detector which operates by using an electrical field between a signal plane and the surface or substance to be monitored for air ions created by collisions with alpha radiation. Without a fan, the detector can operate without the possibility of spreading dust and potential contamination into the atmosphere. A guard plane between the signal plane and the electrically conductive enclosure and maintained at the same voltage as the signal plane, reduces leakage currents. The detector can easily monitor soil, or other solid or liquid surfaces.
摘要翻译： 无风扇长距离α检测器，其通过在信号平面和待监测的表面或物质之间的电场进行操作，以通过与α辐射碰撞产生的空气离子。 没有风扇，检测器可以运行，而不会将灰尘和潜在的污染物扩散到大气中。 信号平面与导电外壳之间的保护平面保持与信号平面相同的电压，可减少漏电流。 检测器可以方便地监测土壤或其他固体或液体表面。
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公开(公告)号：US5525804A
公开(公告)日：1996-06-11
申请号：US382333
申请日：1995-02-01
CPC分类号： G01T1/18
摘要： A background canceling long range alpha detector which is capable of providing output proportional to both the alpha radiation emitted from a surface and to radioactive gas emanating from the surface. The detector operates by using an electrical field between first and second signal planes, an enclosure and the surface or substance to be monitored for alpha radiation. The first and second signal planes are maintained at the same voltage with respect to the electrically conductive enclosure, reducing leakage currents. In the presence of alpha radiation and radioactive gas decay, the signal from the first signal plane is proportional to both the surface alpha radiation and to the airborne radioactive gas, while the signal from the second signal plane is proportional only to the airborne radioactive gas. The difference between these two signals is proportional to the surface alpha radiation alone.
摘要翻译： 背景技术消除长距离α检测器，其能够提供与从表面发射的α辐射和从表面发出的放射性气体成比例的输出。 检测器通过使用第一和第二信号面之间的电场，外壳和要监测的α辐射的表面或物质进行操作。 第一和第二信号面相对于导电外壳保持相同的电压，从而减少漏电流。 在α辐射和放射性气体衰减的情况下，来自第一信号平面的信号与表面α辐射和空气放射性气体成比例，而来自第二信号面的信号仅与机载放射性气体成比例。 这两个信号之间的差异与单独的表面α辐射成比例。
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公开(公告)号：US5281824A
公开(公告)日：1994-01-25
申请号：US864746
申请日：1992-04-07
CPC分类号： G01T7/06 , Y10S250/02
摘要： A detector for atmospheric radon using a long range alpha detector as its sensing element. An electrostatic filter removes ions from ambient air, while allowing radon atoms to pass into a decay cavity. Here, radon atoms are allowed to decay, creating air ions. These air ions are drawn by a fan through a second electrostatic filter which can be activated or deactivated, and into the long range alpha detector. With the second electrostatic filter activated, no air ions are allowed to pass, and the signal output from the long range alpha detector consists of only the electronic background. With the second electrostatic filter deactivated, air ions and cosmic rays will be detected. The cosmic ray contribution can be minimized by shielding.
摘要翻译： 使用长距离α检测器作为其感测元件的大气氡探测器。 静电过滤器从环境空气中除去离子，同时允许氡原子进入衰变腔。 这里，氡原子被允许衰变，产生空气离子。 这些空气离子被风扇吸引通过可被激活或去激活的第二静电过滤器和长距离的α检测器。 激活第二静电过滤器时，不允许空气离子通过，而从远程α检测器输出的信号仅由电子背景构成。 在第二静电过滤器停用时，将检测空气离子和宇宙射线。 宇宙射线的贡献可以通过屏蔽来最小化。
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公开(公告)号：US5514872A
公开(公告)日：1996-05-07
申请号：US395934
申请日：1995-02-27
CPC分类号： G01T1/18 , H01J47/026 , Y10S250/02
摘要： An alpha detector for application in areas of high velocity gas flows, such as smokestacks and air vents. A plurality of spaced apart signal collectors are placed inside an enclosure, which would include smokestacks and air vents, in sufficient numbers to substantially span said enclosure so that gas ions generated within the gas flow are electrostatically captured by the signal collector means. Electrometer means and a voltage source are connected to the signal collectors to generate an electrical field between adjacent signal collectors, and to indicate a current produced through collection of the gas ions by the signal collectors.
摘要翻译： 用于高速气流区域的阿尔法检测器，如烟囱和通气孔。 多个间隔开的信号收集器放置在外壳内，其包括足够数量的烟囱和通气孔，以基本上跨越所述外壳，使得在气流内产生的气体离子被信号收集器装置静电捕获。 电位计装置和电压源连接到信号收集器以在相邻信号收集器之间产生电场，并且指示通过信号收集器收集气体离子而产生的电流。
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