CA2161924A1 - Radon gas measurement apparatus having alpha particle-detecting photovoltaic photodiode surrounded by porous pressed metal daughter filter electrically charged as po-218 ion accelerator - Google Patents

Radon gas measurement apparatus having alpha particle-detecting photovoltaic photodiode surrounded by porous pressed metal daughter filter electrically charged as po-218 ion accelerator

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Publication number
CA2161924A1
CA2161924A1 CA002161924A CA2161924A CA2161924A1 CA 2161924 A1 CA2161924 A1 CA 2161924A1 CA 002161924 A CA002161924 A CA 002161924A CA 2161924 A CA2161924 A CA 2161924A CA 2161924 A1 CA2161924 A1 CA 2161924A1
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CA
Canada
Prior art keywords
radon
electrically charged
measurement apparatus
filter
gas measurement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002161924A
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French (fr)
Other versions
CA2161924C (en
Inventor
Peter J. Diamondis
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Individual
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Individual
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Publication of CA2161924A1 publication Critical patent/CA2161924A1/en
Application granted granted Critical
Publication of CA2161924C publication Critical patent/CA2161924C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/16—Measuring radiation intensity
    • G01T1/17—Circuit arrangements not adapted to a particular type of detector
    • G01T1/178—Circuit arrangements not adapted to a particular type of detector for measuring specific activity in the presence of other radioactive substances, e.g. natural, in the air or in liquids such as rain water
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S250/00—Radiant energy
    • Y10S250/02—Radon detection

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Molecular Biology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Measurement Of Radiation (AREA)

Abstract

A radon detector employs an electrically charged pressed, porous metal filter that allows radon gas diffusion, while blocking ambient light, so that it readily traps both attached and unattached Po-214 and Po-218 ions, that may be present in gas passing through the filter, the filter being charged positively relative to an unbiased PN junction of a photodiode detector within a detection chamber. As a consequence, radon daughter products are prevented from corrupting the radon measurement. Since no voltage differential is applied across its PN junction, the photodiode detector operates in a photovoltaic mode, which avoids the problem of Schottky noise, producing low amplitude current pulses, which are amplified, passband filtered and thresholded to provide well-defined pulses that are counted over a given measurement interval and converted to radon concentration in terms of picocuries per liter.
CA002161924A 1994-11-02 1995-11-01 Radon gas measurement apparatus having alpha particle-detecting photovoltaic photodiode surrounded by porous pressed metal daughter filter electrically charged as po-218 ion accelerator Expired - Fee Related CA2161924C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/333,529 1994-11-02
US08/333,529 US5489780A (en) 1994-11-02 1994-11-02 Radon gas measurement apparatus having alpha particle-detecting photovoltaic photodiode surrounded by porous pressed metal daughter filter electrically charged as PO-218 ion accelerator

Publications (2)

Publication Number Publication Date
CA2161924A1 true CA2161924A1 (en) 1996-05-03
CA2161924C CA2161924C (en) 2003-01-21

Family

ID=23303176

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002161924A Expired - Fee Related CA2161924C (en) 1994-11-02 1995-11-01 Radon gas measurement apparatus having alpha particle-detecting photovoltaic photodiode surrounded by porous pressed metal daughter filter electrically charged as po-218 ion accelerator

Country Status (2)

Country Link
US (1) US5489780A (en)
CA (1) CA2161924C (en)

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ATE389164T1 (en) * 2001-08-17 2008-03-15 Perkin Elmer Int Cv SIGNAL PROCESSING FOR PHOTOCONDUCTIVE DETECTORS
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EP1416296A3 (en) * 2002-10-29 2004-08-11 Université Louis Pasteur, (Etablissement public à caractère scientifique, culturel et professionnel) Electronic device for measuring radiation dose
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US20040232345A1 (en) * 2003-03-31 2004-11-25 Pillalamarri Jagam Continuous monitoring radon detector
US7957507B2 (en) * 2005-02-28 2011-06-07 Cadman Patrick F Method and apparatus for modulating a radiation beam
US8232535B2 (en) 2005-05-10 2012-07-31 Tomotherapy Incorporated System and method of treating a patient with radiation therapy
WO2007014109A2 (en) * 2005-07-22 2007-02-01 Tomotherapy Incorporated System and method of remotely directing radiation therapy treatment
WO2007014092A2 (en) 2005-07-22 2007-02-01 Tomotherapy Incorporated Method of placing constraints on a deformation map and system for implementing same
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AU2006272730A1 (en) * 2005-07-22 2007-02-01 Tomotherapy Incorporated Method of and system for predicting dose delivery
EP1907981A4 (en) 2005-07-22 2009-10-21 Tomotherapy Inc Method and system for evaluating delivered dose
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US7839972B2 (en) * 2005-07-22 2010-11-23 Tomotherapy Incorporated System and method of evaluating dose delivered by a radiation therapy system
US8442287B2 (en) * 2005-07-22 2013-05-14 Tomotherapy Incorporated Method and system for evaluating quality assurance criteria in delivery of a treatment plan
JP2009502255A (en) 2005-07-22 2009-01-29 トモセラピー・インコーポレーテッド Method and system for assessing quality assurance criteria in the delivery of treatment plans
ATE507879T1 (en) * 2005-07-22 2011-05-15 Tomotherapy Inc SYSTEM FOR ADMINISTERING RADIATION THERAPY TO A MOVING TARGET AREA
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JP2009502254A (en) * 2005-07-22 2009-01-29 トモセラピー・インコーポレーテッド Systems and methods for monitoring the operation of medical devices.
KR20080044250A (en) 2005-07-23 2008-05-20 토모테라피 인코포레이티드 Radiation therapy imaging and delivery utilizing coordinated motion of gantry and couch
US20080073738A1 (en) * 2006-09-25 2008-03-27 Unity Opto Technology Co., Ltd. Light-receiving diode
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US20090039270A1 (en) * 2007-08-08 2009-02-12 Cabral Jr Cyril Large-area alpha-particle detector and method for use
FR2926371B1 (en) * 2008-01-10 2012-07-13 Pe Rl RADON DETECTOR AND CONTINUOUS DETECTION DEVICE INCORPORATING SAID DETECTOR.
US8158449B2 (en) * 2008-10-08 2012-04-17 International Business Machines Corporation Particle emission analysis for semiconductor fabrication steps
FR2960979B1 (en) * 2010-06-03 2012-11-30 Gregory Jean DEVICE FOR DETECTING ALPHA PARTICLES
FR2965936B1 (en) * 2010-10-07 2013-06-14 Commissariat Energie Atomique ELECTROCHIMICALLY ASSISTED ALPHA DETECTOR FOR NUCLEAR MEASUREMENT IN A LIQUID ENVIRONMENT
US9480862B2 (en) * 2011-03-07 2016-11-01 Ion Beam Applications S.A. Water equivalent depth measurement for providing a continuous calibration range based on discrete measurements
GB201112478D0 (en) 2011-07-20 2011-08-31 Corentium As Gas sensor
GB201112477D0 (en) * 2011-07-20 2011-08-31 Corentium As Gas sensor
CN102426379B (en) * 2011-11-18 2013-06-19 衡阳师范学院 Method for measuring radon emanation rate by adopting two-stage method
US9291660B2 (en) * 2013-01-22 2016-03-22 Globalfoundries Inc. Method and apparatus for measuring alpha particle induced soft errors in semiconductor devices
US9443633B2 (en) 2013-02-26 2016-09-13 Accuray Incorporated Electromagnetically actuated multi-leaf collimator
CN103487360B (en) * 2013-09-26 2016-07-06 衡阳师范学院 Closed loop quickly measures the method for precipitation rate of radon
CN103984001B (en) * 2014-05-20 2015-12-02 衡阳师范学院 Improve method and the device of static collection emanometer detection sensitivity
CN104155419B (en) * 2014-08-28 2015-07-15 西安科技大学 Experimental device for multi-angle diffusion of radioactive radon in loose coal
CN105223600B (en) * 2015-09-24 2018-07-06 东华理工大学 Balance equivalent radon consistence computational methods based on high-voltage corona sampling method
CN105510205A (en) * 2016-01-13 2016-04-20 西安科技大学 Collection device of migration parameters of radon in coal-rock mass porous media
KR101665385B1 (en) 2016-01-15 2016-10-12 주식회사 아이자랩 Portable radon measurement apparatus and operating method using the same
CN109254313B (en) * 2018-11-15 2022-08-12 衡阳师范学院 Multiple detectors for increasing positive charge 218 Po collection efficiency measurement cavity and method
CN109254314B (en) * 2018-11-15 2022-06-21 衡阳师范学院 With ring electrodes increasing positive charge218Po collection efficiency measurement cavity and method
CN109307880B (en) * 2018-11-15 2022-08-12 衡阳师范学院 Multiple electrode positive charging 218 Po collection efficiency measurement cavity and method
CN109655858B (en) * 2018-12-14 2022-08-12 衡阳师范学院 Multi-electrode measuring instrument pair for improving radon exhalation rate 218 Po collection efficiency measurement cavity and method
CN109655857B (en) * 2018-12-14 2022-06-21 衡阳师范学院 Measuring instrument pair for improving radon exhalation rate by annular electrode218Measuring cavity and method for Po collection efficiency
CN109655859B (en) * 2018-12-14 2022-08-12 衡阳师范学院 Measuring instrument pair with multiple detectors for improving radon exhalation rate 218 Po collection efficiency measurement cavity and method
CN110954935B (en) * 2019-10-22 2021-11-02 中国船舶重工集团公司第七一九研究所 Radon measuring device based on ionization chamber and semiconductor detector
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CN113433579B (en) * 2021-05-18 2023-01-20 中国工程物理研究院激光聚变研究中心 Large-sensitive-surface X-ray spectrum flat response diode detector

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Also Published As

Publication number Publication date
US5489780A (en) 1996-02-06
CA2161924C (en) 2003-01-21

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