ML20010H508
| ML20010H508 | |
| Person / Time | |
|---|---|
| Site: | Wood River Junction |
| Issue date: | 05/21/1981 |
| From: | Bluitt C, Stobie G, Stuart T EG&G, INC. |
| To: | |
| Shared Package | |
| ML20010H500 | List: |
| References | |
| EGG-1183-1756, EGG-1183-1756-R01, EGG-1183-1756-R1, UC-41, NUDOCS 8109240554 | |
| Download: ML20010H508 (10) | |
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w AN AERIAL RADIOLOGICAL SURVEY OF THE AREA SURROUNDING THE UNC RECOVERY SYSTEMS FACIL TY
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WOOD RIVER JUNCTION, RHODE ISLAND DATE OF SURVEY: AUGUST 1979 8109240554 810911 t',
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DISCLAIMER This report was prepared as an account of work sponsored by the United States Government. Neither the United States nor the United States Department of Energy, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability er responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, mark, manufacturer, or otherwise, does not necessarily constitute or imply its 3
cndorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflectthose of the United States Government or any agency thereof.
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Printed in the United States of America.
Available from:
National Technical Information Service U.S. Department of Commerce 5285 Pod Royal Road Springfield, Virginia 22161 Price:
Printed Copy $5.00 Microfiche
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4 Ass,s EGG-1183-1756 ENERGYMEASUREMENTS GROUP First Reyision MAY 1981 AN AERIAL RADIOLOGICAL SURVEY OF THE AREA SURROUNDING THE UNC RECOVERY SYSTEMS FACILITY WOOD RIVER JUNCTION, RHODE ISLAND DATE OF SURVEY: AUGUST 1979 C.M. Bluitt Project Scientist REVIEWED BY T. P. Stuart, Manager Remote Sensing Sciences Department This Document is UNCLASSIFIED G. P. Stobie Classification Officer l
This work was performed by EG&G for the United States Nuclear Regulatory Commission through an EAO transfer of funds to Contract Number DE-AC08-76NV01183 with the United States Department of Energy.
2 ABSTRACT An aerial radiological survey to measure terrestrial gamma radiation was carried out over the UNC Recovery Systems facility located near Wood River Junction, Rhode Island. At the time of the survey (August 1979) materials were being processed at the facility.
Gamma ray data were collected over a 3.28 km2 area centered on the f acility by flying north-south lines spaced 60 m apart. Processed data indicated that detected radioisotopes and their associated gamma ray exposure rates were consistent with those expected from normal background emitters, except directly over the UNC Facility.
Average exposure rates 1 m above the grou nd, as calculated from the aerial data, are presented in the .in of an isopleth map. No ground sample data were taken at the time of the aerial survey.
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CONTENTS 2
Abstract Sections 5
1.0 introduction 5
2.0 Survey Area Location
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6 4.0 Data Processing 6
5.0 Discussion and Results 4,
Fign es 4
1 Flight Lines over the UNC Recovery Systems Facility 5
2 BO-105 Helicopter 6
3 Mobile Computer Processing Laboratory 7
4 Gross Count Exposure Rate Isopleth Map l
8 5 Gamma-Photon Energy Spectrum Observed over the UNC Site identifying the 185 kev Peaks of Uranium-235 8
6 Gamma Photon Ene<gy Spectrum Observed over the Northeast Corner of the Survey Area i
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1.0 INTRODUCTION
The purpose of this aerial survey was to document, at a given point in time, the natural background radiation levels existing in the area and to aid local personnel in evcluating the 8-.
magnitude and spatial extent of any radioactive contaminants existing in the environment. This N[,N)~
f gg(r survey was conducted by Aerial Measuring 2.
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Systems (AMS).
AMS is maintained by the United States Department of Energy (DOE) and operated by EG&G. Begun in 1958, AMS is a continu-ing nationwide program involving surveys to monitor radiation levels in and around facilities producing, utilizing, or storing radioactive
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survey operations at the request of DOE, other Figure 2.
BO-105 HELICOFTER federal agencies (such as the United States
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Nuclear Regulatory Comm:ssion), and state agencies.
On 1 August 1979 this survey was conducted from a base of operations at Quonset Point Naval of the Radiation and Environmental Data Air Station, Rhode Island. The facility surveyed Acquisition and Recorder system (REDAR).
was the UNC Recovery Systems facility.
Twenty Nat (TI) detectors were contained in an aluminum box extended from the rear of the At the time of the survey, the f acility was receiving helicoptor. Each detector was 12.7 cm in diameter highly enriched uranium, which was processed to and 5.1 cm thick. Gamma ray signals from the 20 yield fuel for various uses in test reactor detectors were summed and routed through an operations.
analog-to-digital converter into a pulse height analyzer. Gamma spectra were accumulated in 1 second intervals and recorded on 1/2 inch m gnet tape.
2.0 SURVEY AREA LOCATION The helicopter position was established with two An area 3.28 km2 was surveyed. This area was systems: a Trisponder/202A Microwave Ranging centered on the UNC Recovery Systems facility ysm W% and an AW rahamn M located 1.2 km southeast of Wood River Junction master station mounted in the Trisponder, and 1 km north of Indian Cedar Swamp.
helicopter interrogated two remote transceivers I
mounted on towers outside the survey area By measuring the round trip propagation time c
between the master and remote stations the 3.0 SURVEY METHOD AND AIRBORNE master computed the distance to each. These EQUIPMENT distances were recor.1ed on magnetic tape each second. In subsequent computer processing they An enlarged aerial photograph of the site was were converted to positon coordinates, used to lay out the survey flight lines. The survey pattern consisted of 21 parallellines spaced at 60 in like manner the radio altimeter measured the m intervals,2.6 km in length. The flight lines were time faa for the return of a pulsed signal and oriented in a north-soJth direction (Figure 1).
conver ted this to aircraf t altitude. For altitudes up Flight altitude was 45 meters.
to 150 m, the accuracy was 10.6 m or 2%,
whichever was greater These data were also A B0-105 helicopter was utilized for the survey recorded on magnetic tape so that any variations (Figure 2). The 80-105 carried a crew of two: pilot in gamma signal strength caused by altitude and navigator. It employed a lightweight version f!uctuation could be compensated accurately.
6 The detectors and electronic systems which The gross count data (integral counts between 50 accumulate and record the data are described
'.. and 3000 kev) were corrected for system briefly here. They are described in more detailin a t.ead time and altitude deviation. Corrections to previous report.*
the gross count rates were also made for contributions from airborne radon daughters, aircraft background, and cosmic rays. Flights over a lake near Wood River Junction were used to determ:ae these contributions.
4.0 DATA PROCESSING The corrected gross count rates were converted Data processing was done with the Radiation and to exposure rates at 1 m altitude, using the factor Environmental Data Analyzer and Computer 1100 counts per second (cps) per R/h obtamed system (REDAC). This computer analysis from calibration data ovcr a Nevada test range.
laboratory was mounted in a mobile van for this survey (Figure 3). The v'In and aircraft were based at the Quonset Pcint Naval Air Station.
The REDAC consined primarily of two Cipher 5.0 DISCUSSION AND RESULTS Data tape drives, a Data General NOVA 840 Analys.is of the radiolog.ical data taken over the computer, two Calcomp plotters, and a area spoWing h E &coveg Systems Tektronics CRT display screen. The computer facility indicated that the terrestrial radioisotopes had a 32 k-word core memory and an additional and associated gamma ray exposure rates were 1.2 x 106-word disc memory. An extensive consistent with the natural background normally collection of software routines was available for found within areas having similcr geological data processing.
bases, except directly over the UNC Facility.
iigure 4 presents exposure rate isopleths superimposed on an aerial photograph of the site.
. Boyns, P.K. July 1976. The Aerial RadiologrCa! Measuring System (ARMS): Systems. Procedures. and Sensitivrty The background in the area is in the range of (1976). Report No. EGG-1183-1691. Las Vegas. NV: EG&G.
5-8 R/h (including cosmic ray contributions).
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8 Aerial raciological detection systems average the levels in the vicinity of the UNC facility are likely radiation levels due to gamma-emitting to be higher than the 12 R/h as given in Figure 4.
radionuclides existing Over an area of several acres. The systems are capable of detecting Figure 5 presents the energy spectrum of the high anomalous gamma count rates and determining radiation level observed over the UNC site due to the specific radionuclides causing the anomalies; contributions from enriched uranium.
however, because of averaging, they tend to underestimate the magnitude of localized Figure 6 shows a spectrum over the northeast sources as compared with ground-based corner of the site due to a slight increase in readings. Therefore, the ground level radiation naturally occurring radioisotopes.
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GAMMA PHOTON ENERGY SPEC TRUM OBSERVED OVER THE UNC SITE IDENTIFYING THE 185 OBSERVED OVER THE NORTHEAST CORNER OF THE kev PEAKS OF URANIUM-235 SURVEY AREA l
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