Real-time remotely programmable radioactive gas detecting and measuring system

• US 6,768,116 B1
• Filed: 05/03/2002
• Issued: 07/27/2004
• Est. Priority Date: 05/04/2001
• Status: Expired due to Fees

• Current Assignee: Remote Data Technologies LLC
• Original Assignee: Remote Data Technologies LLC
• Inventors: Averill, Linda A., Gram, Herbert R., Berman, Michael F., Boncek, Randolph L.
• Primary Examiner(s): Hannaher, Constantine
• Assistant Examiner(s): Moran, Timothy J.
• Application Number:
  US10/138,670
• Publication Number:
  US 20040129890A1
• Time in Patent Office: 816 Days
• Field of Search: 250/374, 250/379, 250/380, 250/253, 250/255, 250/474.1
• US Class Current: 250/380
• CPC Class Codes: G01T 1/178 for measuring specific activity in the presence of other radioactive substances, e.g. natural, in the air or in liquids such as rain water

Abstract

A system is presented for remotely measuring a concentration of a target material (e.g., radioactive gas, suspended aerosols or non-radioactive gaseous chemistries). The system includes a data processing system and a monitoring device. The device includes a detector having a chamber, collector in the chamber and a sensor. The target material enters the chamber. The collector collects ions generated by decay of the material. In one embodiment, the sensor measures changes in an electrostatic potential of the collector in response to the ions. In another embodiment, the sensor includes a scintillation counter that measures alpha or beta particles and provides an energy spectrum. In another embodiment, the sensor includes a material whose optical properties vary according to fields formed within the sensor. The device includes a transmitter for transmitting the potential, the spectrum or the field strength to the processing system for determining the concentration of the target material.

Claims

1. A system for detecting and measuring one of a concentration of physical and chemical properties of a target material within an environment of interest, said system comprising:

a testing facility having a data processing system disposed therein; and

a monitoring device disposed within said environment of interest and operatively coupled to said data processing system, said monitoring device comprising;

a detector having a housing defining a chamber, a collector disposed in said chamber and a sensor electrically coupled to said collector, said housing having at least one opening for allowing said target material within said environment of interest to enter said chamber, said collector for measuring one of a number of ions and gamma radiation generated by a decay of said target material within said chamber, and said sensor for selectively measuring changes in an electrostatic potential of said collector in response to an accumulation of said generated ions and said gamma radiation;

a transmitter for transmitting said measured changes in said electrostatic potential to said data processing system; and

a receiver for receiving signals from said data processing system, said signals including parameters employed by said sensor in said selective measuring;

wherein said data processing system selects said parameters from a plurality of parameters in accordance with said concentration of said target material determined by said data processing system from previously transmitted measured changes in said electrostatic potential.

2. The system as set forth in claim 1 wherein said parameters include a frequency at which said electrostatic potential are measured and a total duration of said measuring.

3. The system as set forth in claim 2 wherein said monitoring device includes a memory device for storing a plurality of electrostatic measurements taken at time periods corresponding to said frequency.

4. The system as set forth in claim 1 wherein said collector is comprised of an electret including two oppositely charged conductive surfaces, said surfaces forming an electric field therebetween.

5. The system as set forth in claim 1 wherein said sensor is comprised of one of an electrometer, a non-surface contact electrostatic probe and a scintillation crystal.

6. The system as set forth in claim 1 wherein said housing includes a second opening and wherein said detector includes an air movement device disposed within said second opening, said air movement device for circulating an atmosphere within said chamber to provide a substantially constant air-flow within said chamber.

7. A system for detecting and measuring one of a concentration of physical and chemical properties of a target material within an environment of interest, said system comprising:

a testing facility having a data processing system disposed therein; and

a monitoring device disposed within said environment of interest and operatively coupled to said data processing system, said monitoring device comprising;

a detector having a housing defining a chamber, a collector disposed in said chamber and a sensor electrically coupled to said collector, said housing having at least one opening for allowing said target material within said environment of interest to enter said chamber, said collector for detecting target chemical compounds within said chamber, and said sensor for selectively measuring integrated electrical signals of said collector in response to an accumulation of said chemical compounds;

a transmitter for transmitting said measured changes in said electrostatic potential and/or integrated electrical signals to said data processing systems; and

a receiver for receiving signals from said data processing system, said signals including parameters employed by said sensor in said selective measuring;

wherein said data processing system selects said parameters from a plurality of parameters in accordance with said concentration of said target material determined by said data processing system from previously transmitted measured changes in said electrostatic potential and/or said integrated electrical signals.

8. The system as set forth in claim 7 wherein said collector is comprised of a scintillation counter.

9. A system for detecting and measuring a concentration of one of radioactive gas, suspended aerosol and non-radioactive gaseous chemistries within an environment of interest, said system comprising:

a testing facility having a data processing system disposed therein; and

a monitoring device disposed within said environment of interest and operatively coupled to said data processing system, said monitoring device comprising;

a detector having a housing defining a chamber and a sensor disposed in said chamber, said housing having at least one opening for allowing said radioactive gas, said suspended aerosol particles and said chemistries within said environment of interest to enter said chamber, said sensor including a material disposed within one of an electric and magnetic field formed within said sensor, said material having optical properties that vary in response to changes in said field, wherein changes over time of said optical properties is representative of changing field strengths; and

a transmitter for transmitting said changing field strength to said data processing system.

10. The system as set forth in claim 9 wherein said material includes a first end and a second end and said sensor includes:

a first surface;

a second surface;

wherein one of said electric and magnetic field is formed between said first surface and said second surface;

a light source disposed at said first end of said material, said light source emitting a beam that travels through said material from said first end to said second end; and

a beam detector disposed at said second end of said material, said beam detector for detecting a location of said beam exiting said material;

wherein changes over time of said detected beam location represents changes in said field strength.

11. A monitoring system for measuring a concentration of one of a radioactive gas, radioactive aerosol particles and non-radioactive gaseous chemistries within an environment of interest, said system comprising:

a data processing system having programming logic for determining said concentration of said radioactive gas, said radioactive aerosol particles and said non-radioactive gaseous chemistries from a plurality of data points; and

a programmable monitoring device coupled to said data processing system by a communication network, said monitoring device comprising;

a sensor having a housing defining a chamber and a collector for collecting ions generated by a decay of said radioactive gas, said radioactive aerosol particles and said non-radioactive gaseous chemistries within said chamber, said housing having at least one opening for allowing said radioactive gas, said radioactive aerosol particles and said non-radioactive gaseous chemistries within said environment of interest to enter said chamber;

a detector for selectively measuring changes in an electrostatic potential of said collector in response to an accumulation of said generated ions;

a transmitter for transmitting said measured changes in said electrostatic potential to said data processing system, said measured changes corresponding to said plurality of data points; and

a receiver for receiving signals from said data processing system, said signals including parameters employed by said sensor in said selective measuring;

wherein said data processing system selects said parameters from a plurality of parameters in accordance with said concentration of said target material determined by said data processing system from previously transmitted measured changes in said electrostatic potential.

12. The monitoring system as set forth in claim 11 wherein said parameters include a frequency at which said electrostatic potential corresponding to different alpha particle energies is measured and a total duration of said measuring.

13. A method for detecting and measuring one of a concentration of a radioactive gas and suspended radioactive aerosols within an environment of interest, comprising:

providing a housing defining a chamber;

providing a sensor disposed in the chamber, the sensor including a material having optical properties that vary in response to changes in one of an electric and magnetic field;

allowing the radioactive gas and the suspended radioactive aerosols to diffuse into the chamber;

forming one of an electric and magnetic field about the material;

decreasing a strength of the field in proportion to ions generated by a decay of the radioactive gas and suspended radioactive aerosols;

selectively measuring a change in the strength of the field by measuring changes in the optical properties of the material; and

transmitting the measurements of the changing field strength to a data processing system having programming logic for calculating the concentration of the radioactive gas and suspended radioactive aerosols from the transmitted measurements.