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1. 发明授权

EP2705386B1 NEUTRON SPECTROMETER 失效
标题翻译：中子谱仪
公开(公告)号：EP2705386B1
公开(公告)日：2015-09-30
申请号：EP12720561.5
申请日：2012-05-02
申请人： Symetrica Limited
发明人： RAMSDEN, David , GILES, Calvin
IPC分类号： G01T3/06 , G01V5/00
CPC分类号： G01T3/001 , G01T3/06 , G01V5/0091

2. 发明授权

EP2593813B1 RADIATION DETECTOR 有权
公开(公告)号：EP2593813B1
公开(公告)日：2014-04-09
申请号：EP11730405.5
申请日：2011-06-30
申请人： Symetrica Limited
发明人： RAMSDEN, David , GILES, Calvin
IPC分类号： G01T3/06
CPC分类号： G01T3/06 , G01T1/203

3. 发明公开

EP2019974A1 SPECTROMETER WITH PLASTIC SCINTILLATOR PROVIDED WITH A SPECULAR REFLECTOR 有权
标题翻译：配有光谱分析仪有反射REFLECTOR EQUIPPED塑料闪烁体
公开(公告)号：EP2019974A1
公开(公告)日：2009-02-04
申请号：EP07712921.1
申请日：2007-03-16
申请人： Symetrica Limited
发明人： RAMSDEN, David , BURT, Christopher, David, Henry
IPC分类号： G01T1/20 , G01T1/36
CPC分类号： G01T1/203 , G01T1/2002 , G01T1/362
摘要： A gamma-ray detector (42, 52, 72, 92) comprising a large-area plastic scintillation body (44, 64, 74, 94) and a photon detector (38, 58, 68, 78) optically coupled to the scintillation body to receive and detect photons (P1, P2, P3) generated by gamma-ray interactions. Selected portions of the scintillation body surface are provided with a reflective layer (46, 60, 80) in planar contact with the scintillation body. Other regions are not provided with a reflective layer. Thus specular reflection is promoted in at the surfaces provided with the reflective layer, while total internal reflection may occur in the regions which are not provided with a reflective layer, hi a scintillation body generally in the form of a plank, the photon detector is coupled to one end, and the regions provided with the reflective layer are the edges of the plank. The scintillation body may be shaped so that it reduced in cross section in a direction away from the photon detector. The spectrometer may include photon detectors coupled to both ends of the scintillation body.

4. 发明公开

EP4302137A1 DOSIMETER APPARATUS AND METHODS 审中-实审
公开(公告)号：EP4302137A1
公开(公告)日：2024-01-10
申请号：EP22706659.4
申请日：2022-02-25
申请人： Symetrica Limited
发明人： RAMSDEN, David
IPC分类号： G01T1/02 , G01T1/20 , A61B6/00

5. 发明授权

EP1749220B1 GAMMA RAY DETECTORS 有权
公开(公告)号：EP1749220B1
公开(公告)日：2019-10-09
申请号：EP05742167.9
申请日：2005-05-13
申请人： Symetrica Limited
发明人： RAMSDEN, David , DALLIMORE, Matthew
IPC分类号： G01T1/203
摘要： A gamma ray detector (50) comprises a plastic scintillation body (52) arranged to receive incident gamma rays to be detected. Photons are generated in response to the gamma rays by excitation and de-excitation processes in the scintillation body. The photons are detected using at least one photodetector (56) which generates an output signal representative of the energy of the gamma rays. The scintillation body has a detection surface to receive the gamma rays and a thickness in a direction substantially orthogonal to the detection surface that is not greater than 5 cm. Deconvolution techniques can be used to improve the output signal; the thinness of the scintillation body allows sufficiently accurate results to be obtained that individual isotopes can be readily identified. The detector can be usefully employed in portal radiation monitors.

6. 发明公开

EP2705386A1 NEUTRON SPECTROMETER 失效
标题翻译：中子光谱仪
公开(公告)号：EP2705386A1
公开(公告)日：2014-03-12
申请号：EP12720561.5
申请日：2012-05-02
申请人： Symetrica Limited
发明人： RAMSDEN, David , GILES, Calvin
IPC分类号： G01T3/06 , G01V5/00
CPC分类号： G01T3/001 , G01T3/06 , G01V5/0091
摘要： A neutron spectrometer is described. The spectrometer includes a first conversion screen (8) comprising a neutron absorbing material and a phosphor material, a first wavelength-shifting light-guide (14) arranged to receive photons from the phosphor material of the first conversion screen and generate wavelength-shifted photons therefrom and a first photodetector (22)optically coupled to the first wavelength-shifting light-guide and arranged to detect the wave- length-shifted photons. The spectrometer further includes a second conversion screen (12) comprising a neutron absorbing material and a phosphor material, a second wavelength-shifting light-guide (16) arranged to receive photons from the phosphor material of the second conversion screen and generate wavelength-shifted photons there- from, and a second photodetector (24) optically coupled to the second wavelength-shifting light-guide and arranged to detect the wave- length-shifted photons. A neutron moderator material is arranged between the first and second conversion screens to moderate neutrons.
摘要翻译：描述了中子分光计。该分光计包括：第一转换屏幕（8），其包括中子吸收材料和磷光体材料;第一波长偏移光导（14），其被布置为接收来自第一转换屏幕的磷光体材料的光子并产生波长偏移光子以及第一光电检测器（22），其光学地耦合到第一波长偏移光导并且被布置为检测波长偏移的光子。该光谱仪还包括包含中子吸收材料和磷光体材料的第二转换屏幕（12），第二波长偏移光导（16），布置成接收来自第二转换屏幕的磷光体材料的光子并产生波长偏移以及第二光电检测器（24），其光学耦合到第二波长偏移光导并且被布置为检测波长偏移的光子。中子慢化剂材料被布置在第一和第二转换屏幕之间以调节中子。

7. 发明授权

EP2102636B1 RADIOACTIVE ISOTOPE IDENTIFICATION 有权
标题翻译：识别放射性同位素
公开(公告)号：EP2102636B1
公开(公告)日：2012-04-11
申请号：EP07824168.4
申请日：2007-10-16
申请人： Symetrica Limited
发明人： RAMSDEN, David , DALLIMORE, Matthew , CROSSINGHAM, Grant
IPC分类号： G01T1/164 , G01T1/167 , G01T1/38
CPC分类号： G01T1/1642 , G01T1/167 , G01T1/38
摘要： A method of identifying radioactive components in a source comprising (a) obtaining a gamma-ray spectrum from the source; (b) identifying peaks in the gamma-ray spectrum; (c) determining an array of peak energies and peak intensities from the identified peaks; (d) identifying an initial source component based on a comparison of the peak energies with a database of spectral data for radioactive isotopes of interest; (e) estimating a contribution of the initial source component to the peak intensities; (f) modifying the array of peak energies and peak intensities by subtracting the estimated contribution of the initial source component; and (g) identifying a further source component based on a comparison of the modified array of peak energies with the database of spectral data. Thus a method for identifying radioactive components in a source is provided which does not rely on comparing template spectra with an observed spectrum.

8. 发明公开

EP2329297A2 STABILIZATION IN GAMMA-RAY SPECTROMETRY 审中-公开
标题翻译： γ射线光谱法稳定化
公开(公告)号：EP2329297A2
公开(公告)日：2011-06-08
申请号：EP09784805.5
申请日：2009-07-28
申请人： Symetrica Limited
发明人： RAMSDEN, David
IPC分类号： G01T1/40
CPC分类号： G01T1/40
摘要： A calibration source (20) for a gamma-ray spectrometer (40) is provided. The calibration source comprises a radioactive material (30) comprising a radioactive isotope having a decay transition associated with emission of a radiation particle and a gamma-ray having a known energy, e.g.Na-22, and a solid-state detector (26A, 26B), e.g. a PIN photodiode, arranged to receive radiation particles emitted from thE radioactive material. A gating circuit (32) is coupled to the solid-state detector and is operable to generate a gating signal in response to detection of a radiation particle in the solid-state detector. The gating signal may thus be used as an indicator that an energy deposit in a nearby gamma-ray spectrometer is associated with a decay transition in the radioactive isotope. Since these energy deposits are of a known energy, they can be used as reference points to calibrate the spectrometer response. Thus with calibration sources according to embodiments of the invention, spectral stabilization (i.e. accounting for a changing spectrometer response, as well as base calibration) may be performed in real time and in parallel with obtaining a spectrum of observed signal events (i.e. the spectrum of interest). Furthermore, this is achieved with little contamination of the spectrum events of interest.
摘要翻译：提供用于伽马射线谱仪（40）的校准源（20）。校准源包括放射性材料（30），该放射性材料（30）包括放射性同位素和固态检测器（26A，26B），放射性同位素具有与辐射颗粒和具有已知能量的伽马射线（例如Na-22）），例如 PIN光电二极管，布置成接收从放射性材料发射的辐射粒子。选通电路（32）耦合到固态检测器并且可操作以响应于检测到固态检测器中的放射粒子而生成选通信号。门控信号因此可以用作指示附近伽马射线光谱仪中的能量沉积物与放射性同位素中的衰变转变相关联的指示。由于这些能量沉积物具有已知的能量，因此它们可以用作校准光谱仪响应的参考点。因此，对于根据本发明实施例的校准源，可以实时地并且与获得所观察到的信号事件的频谱（即频谱的频谱）并行地执行频谱稳定化（即，考虑变化的频谱仪响应以及基本校准）利益）。此外，这是在对感兴趣的频谱事件几乎没有污染的情况下实现的。

9. 发明公开

EP3077852A1 GAMMA-RAY DETECTOR 有权
标题翻译：伽马射线探测器
公开(公告)号：EP3077852A1
公开(公告)日：2016-10-12
申请号：EP14806373.8
申请日：2014-11-28
申请人： Symetrica Limited
发明人： RAMSDEN, David , FOSTER, Mark Abbott
IPC分类号： G01T1/169
摘要： A gamma-ray detector for determining the direction to a source of gamma-rays is described. The detector comprises a first scintillation body coupled to a first photodetector and a second scintillation body coupled to a second photodetector, wherein the first scintillation body and the second scintillation body are arranged to be co-axial with a pointing axis of the detector. The detector further comprises a processing circuit arranged to receive output signals associated with the first and second photodetectors for a plurality of different orientations of the pointing axis of the detector relative to a reference direction. The processing circuit is further operable to determine a direction to the source of gamma-rays relative to the reference direction based on output signals associated with the first and second photodetectors for the plurality of different orientations of the pointing axis of the detector relative to the reference direction.

10. 发明授权

EP2047293B1 GAMMA-RAY DETECTOR 有权
标题翻译： X射线探测器
公开(公告)号：EP2047293B1
公开(公告)日：2015-05-06
申请号：EP07766299.7
申请日：2007-07-19
申请人： Symetrica Limited
发明人： RAMSDEN, David , BURT, Christopher David Henry
IPC分类号： G01T1/164 , G01T1/29 , G01T1/00
CPC分类号： G01T1/1644 , G01T1/2907 , G01T7/00

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