Air quality monitoring system and process

• US 5,468,968 A
• Filed: 12/13/1991
• Issued: 11/21/1995
• Est. Priority Date: 12/13/1991
• Status: Expired due to Fees

• Current Assignee: Canberra Industries, Inc. (American Capital Limited)
• Original Assignee: Nuclear Fuel Services, Inc.
• Inventors: Lamie, James M., Sparks, Robert M., Holley, Robert G., Byers, Lonnie L., West, Mike L., Storey, Richard P., Bailey, William H.
• Primary Examiner(s): FIELDS, CAROLYN
• Application Number:
  US07/807,110
• Time in Patent Office: 1,439 Days
• Field of Search: 250/328, 250/271, 250/432 R, 250/435, 250/304, 250/370.07, 250/336.1, 250/337
• US Class Current: 250/435
• CPC Class Codes: G01T 7/04 by filtration

Abstract

A system for the collection and use of radiation data on airborne particulate materials, which system provides one or more facets of enhanced data accuracy, security, retrievability, accountability of personnel, chain of custody, or the like, the system having the following components:

(a) an airborne material collection filter means having bar code indicia thereon;

(b) a computer adapted for storing and/or processing record data and property data;

(c) a bar code reader adapted for interfacing with the bar code on the filter means and accessing record data thereon, the reader also being adapted for interfacing with the computer for the transport of record data thereto; and

(d) a radiation counter adapted for analyzing and providing radioactivity (property data) on particulate materials collected by the filter means and for interfacing with the computer for the transport of the property data thereto;

(e) the computer being adapted for correlating the record data and property data and calculating and reporting work radiation exposure, and/or forwarding the same to storage or further data processing facilities.

Claims

1. A system for the collection of property data on samples of airborne particulate materials, and of bar coded record data comprising identification of said samples and of each sample collection means and its location, of worker(s) total time exposure periods, and of said worker(s) exposure history, said property data comprising α

, β

radiation counts, said system providing one or more facets of enhanced property data accuracy, data security, data retrievability, accountability of personnel, chain or data custody, or use of worker record data and being adapted for ultimately attaining active worker minimal radiation exposure, said system comprising;

(a) airborne material collection means adapted for use within a workplace and having bar coded indicia means thereon containing record data for said worker(s) including collection means identification;

(b) computer means adapted for receiving and processing said record data and said property data;

(c) retrieval means being adapted for accessing said bar coded record data for one or more workers entering and leaving said workplace during the collection period, and further being adapted for interfacing with said computer means for the selective transport of said record data of said one or more workers thereto; and

(d) analysis means adapted for measuring said radiation and providing radiation property data on materials collected by said collection means, and further being adapted for interfacing with said computer means for the transport of said property data thereto;

(e) said computer means being adapted for providing additional record data and for correlating all record data and said property data and calculating total radiation exposure levels for each of said one or more workers and reporting and/or forwarding the same to data storage or to further data processing facilities.

2. The system of claim 1 wherein said collection means comprises holder means adapted to contain filter means having bar code label means thereon containing record data, and wherein said retrieval means comprises bar code reading means.

3. The system of claim 2 wherein said holder means is also provided with bar code label means.

4. The system of claim 2 wherein said analysis means is adapted to receive said filter means and is provided with bar code reading means for recording record data from said label means on said filter means, said analysis means further being adapted for the transport of said record data to said computer means.

5. The system of claim 4 wherein carrier means is provided for said filter means, said carrier means having window means therein adapted for registration with said label means on said filter means for providing access thereto by said reading means.

6. The system of claim 5 wherein said filter means comprises a card having aperture means therethrough, filter element means affixed to said card and substantially covering said aperture means, and said label means being affixed to said card in a position removed from said filter element means.

7. The system of claim 6 wherein said analysis means is provided with a loading magazine adapted to hold a plurality of carrier means in a substantially vertically oriented stack, and wherein each said carrier means and said magazine are provided with cooperating locator means for aligning said window means with said reading means.

8. The method of obtaining reliable and accurate radiation exposure data for one or more workers who typically enter and exit at least one workplace one or more times during said one or more worker'"'"'s workshifts, said method comprising:

a) taking at least one airborne particulate, filter sample within each workplace with air pressure differential operated filter sampling means, and incident and substantially concurrently thereto, retrieving and recording in computer means record data comprising sample identity, each worker identity, time of each entry and exit of each worker at each workplace, time of each sampling initiation and termination, and air flow rate through each sampling means;

b) placing each sample in radiation counting means which is provided with means for identifying each sample and relating the same to the aforesaid record data including sample identity in said computer means;

c) counting the radiation from each sample and transporting the count as property data to said computer means;

d) correlating said record data and property data within said computer means and calculating and reporting total radiation exposure of each said one or more workers during the sampling period.

9. The method of claim 8 wherein said sampling means comprises a differential pressure operated holder and filter means contained therein, wherein both said holder and filter means are provided with bar code identification indicia, wherein said filter means is placed in said counting means without regard to sample order or stacking sequence, and wherein said counting means has the capacity for and reads the bar code identification indicia directly from the filter means.

10. The method of claim 8 wherein said record data is obtained by bar code reading means from bar code label means associated with each sample, and wherein said record and property data are transported to computer means having the capacity for calculating from the property data, sampling period, and air flow rate, an α

, β

radiation exposure profile for the worker.

11. The method of claim 8 wherein said worker is provided with apparel worn, bar code worker identification, providing in each said workplace air sampling means having filter means, each said sampling means having bar code identification associated therewith, reading said sampling means bar code with bar code reading means at the time of sampling initiation and termination and recording as record data the sampling identification and times and dates of said iniation and termination, reading said worker identification bar code with bar code reading means each time said worker enters or exits a workplace and recording as record data the worker indentification and the time and dates of each of said entries and exits, transporting said record data to a programmed computer, placing said filter means in said radiation counting means, counting the radiation from said filter means and transporting the count as property data along with the filter means identification record data to said computer, correlating said record data and property data within said computer and calculating and reporting radiation exposure of said worker.

12. The method of claim 11 wherein said sampling means comprises a suction operated holder for said filter means contained therein, wherein both said holder and filter means are provided with bar code identification, wherein said filter means is placed in said counting means without regard to sample order or stacking sequence, and wherein said counting means has the capacity for and reads the bar code identitifcation directly from said filter means.

13. The method of obtaining reliable and accurate readiation exposure data for a worker who typically enters and exits at least one workplace one or more times during said worker'"'"'s workshift, said method comprising the steps of:

a) at the beginning of each work activity, loading an air filter for particulate materials into a holder which is provided with a bar code label carrying holder location data, the holder being selectively located within a workstation area to provide a highly representative sampling of actual work air-inhalation;

b) after loading the filter, scanning the holder label with a programmed bar code reader to record the holder workstation location and the time and date of scanning;

c) actuating the holder by placing in communication with a pressure differetial system via an in-line flow meter which controls and monitors the air flow rate through the filter;

d) repeating steps a) b) and c) for all such workplace air sampling locations;

e) at the end of a prescribed period, removing each filter from its holder (vacuum broken) and placing in an envelope which bears a bar code label identifying the particular sample carrier by number into which the filter is to be placed for counting;

f) scanning both the label on the holder and the label on the envelope with said reader and recording and correlating the data therefrom along with the time and date of scanning;

g) transporting the reader data to a programmed computer;

h) scanning the envelope label with a reader which gives a visual display of the identifying number of the carrier into which the filter is to be loaded;

i) loading the filters into the carriers and placing the carriers in numerical order in the magazine and actuating the counter;

j) after the couner has completed radioactivity (property data) analysis of each filter, importing the data as assigned to each carrier identification to the computer; and

k) correlating the record data and property data in the computer and perfroming worker exposure analysis thereof and reporting the same.

14. The method of obtaining reliable and accurate radiation exposure data for a worker who typically enters and exist at least one workplace one or more times during said worker'"'"'s workshift, said method comprising the steps of:

a) at the beginning of each work activity, a card having an air filter for particulate materials affixed thereto, and bearing a bar code label, is scanned by a programmed bar code reader which records the card identification;

b) the card is then loaded into a holder which is selectively located within a workstation area to provide a highly representative sampling of actual worker air-inhalation;

c) after loading the filter, the reader scans a bar code label attached to the holder and records its workstation location along with the time and date of scanning, the holder then immediately being actuated by placing in communication with a vacuum system via an in-line flow meter which contrlos and monitors the air flow rate through the filter;

d) steps a) b) and c) are repeated for all such workstations air sampling locations;

e) at the end of a prescribed period, each card is removed from its holder (vacuum broken) and the labels on the card and holder immediately scanned by the reader which records the time and date of scanning and correlates the same with the holder location, card identification, time and date of sampling initiation and termination, and any other relevant record data stored in the reader;

f) the reader than transports the record data to a PC;

g) each card is subsequently loaded into a sample carrier having a bar code viewing window, and the carriers then loaded into a radiation counter magazine, the counter being in communication with the PC for transport of property data thereto and is provided with an internal bar code reader which records the record data from the card label;

h) after the counter has completed radioactivity (property data) analysis of each filter, the PC imports the data as assigned to each card identification;

i) the PC then correlates the record data and property data, and performs worker exposure analysis thereof, and, if desired, prints reports of this analysis, or in the alternative, exports the data to a centralized database for further analysis, further correlation with other record data including the worker'"'"'s medical status and history, and/or data storage.

15. The method of obtaining reliable and accurate radiation exposure data for a worker who typically enters and exits at least one workplace one or more times during said worker'"'"'s workshift, said method comprising the steps of:

a) at the beginning of each work activity, a card having an air filter for particulate materials affixed thereto, and bearing a bar code label, is scanned by a programmed bar code reader which records the card identification, the card then being loaded into a holder which is then affixed to the worker'"'"'s clothing proximate said worker'"'"'s breathing zone to provide a highly representative sampling of the worker'"'"'s actual air-inhalation;

b) the reader then scans a bar code label worn by the worker and records the worker identification along with the time and date of scanning;

c) the holder is then immediately actuated by placing in communication with a vacuum system worn by the worker, via an in-line flow meter which controls and monitors the air flow rate through the filter;

d) steps a) b) and c) are repeated for all such work station air sampling locations;

e) at the end of a prescribed period, each card is removed from its holder (vacuum broken) and the labels on the card and worker immediately scanned by the reader which records the time and date of scanning and correlates the same with the card and worker identification, and time and date of sampling initiation and termination;

f) the reader then transports the record data to a PC;

g) each card is subsequently loaded into a sample carrier having a bar code viewing window, and the carriers then loaded into a radiation counter magazine, the counter being in communication with the PC for transport of property data thereto and being provided with an internal bar code reader which records the record data from the card label;

h) after the counter has completed radioactivity (property data) analysis of each filter, the PC imports the data as assigned to each card identification;

i) the PC then correlates the record data and property data, and performs personnel exposure analysis thereof, and prints reports of this analysis, or in the alternative, exports the data to a centralized database for further analysis, further correlation with other record data, or to data storage.

16. A method for monitoring and analyzing workplace radioactivity levels to provide a measure of internal radiation dose which is representative of the exposure the worker received, this internal exposure being added to the external exposure or dose received by the worker, for providing an assignment of total radiation exposure for the worker, said method comprising:

1) bar code scanning a worker'"'"'s identification and correlating the same in computer means with a first air filter sample identification;

2) obtaining said first air filter sample of particulate material representative of that actually breathed in by and constituting an internal radiation exposure for said worker over a period of time;

3) obtaining α

, β

radiation counts for said first sample and calculating a radiation exposure value for said worker and transmitting said exposure value to said computer means;

4) combining and correlating in said computer means said exposure value with internal radiation exposure values obtained from samples comprising one or more of instantaneous or incremental urine or feces, to give a summed internal radiation exposure value for said worker;

5) obtaining an external radiation exposure value for said worker;

6) correlating and combining in said computer means said internal and external exposure values to give a total radiation exposure value for said worker.