RADIOACTIVE TRACERS AND CONTROL SURVEY MONUMENTS

RESULTS ARE SUMMARIZED OF A FEASIBILITY STUDY AND IMPLEMENTATION OF THE INCORPORATION OF RADIOACTIVE TRACERS IN NEW JERSEY LOCAL CONTROL SURVEY MONUMENTS. NEARLY 10,000 HORIZONTAL AND VERTICAL CONTROL MONUMENTS WERE ESTABLISHED IN NEW JERSEY DURING THE DEPRESSION YEARS. WITH THE EXCEPTION OF TRIANGULATION STATIONS, ALL CONTROL MONUMENTS IN THIS SYSTEM ARE LOCATED WITHIN RIGHT-OF-WAY LINES ALONG PRIMARY AND SECONDARY ROADS. THOSE STATIONS WHICH PROJECT ABOVE THE GROUND SURFACE ARE EASILY RECOVERED, BUT AT THE SAME TIME, ROAD MAINTENANCE OPERATIONS MAY EVENTUALLY DESTROY THE POSITION. VISIBLE MONUMENTS ARE SUSCEPTIBLE TO VANDALISM. INCLUDING THE THOUSANDS OF MONUMENTS WHICH HAVE BEEN BURIED BY GREAT CHANGES, OR ORIGINALLY PLACED BELOW GRADE, THE SYSTEM IS SLOWLY MOVING UNDERGROUND. CONSIDERING THE FACT THAT EACH STATION REPRESENTS OVER $200 IN FIRST COSTS AND, OVER A PERIOD OF TIME SEVERAL HUNDREDS OF DOLLARS TO LOCAL ENGINEERS AND SURVEYORS, ANY PROCEDURE WHICH WILL ASSIST IN PROTECTION AND RECOVERY IS COMPLETELY JUSTIFIABLE. RADIOACTIVE MATERIAL WAS INCORPORATED IN MONUMENTS, THUS FIXING THE IONIZING RADIATION SOURCE IN A CONTAINING ENVIRONMENT, AND PREVENTING REMOVAL OF THE TRACER BY ROAD MAINTENANCE MACHINERY. MONAZITE WAS USED AS A TRACER. A RADIATION INTENSITY ANALYSIS OF THE TRACER WAS MADE WITH A SCINTILLATOR. MEASUREMENTS OF SEVERAL SIX-POUND SAMPLES INDICATED THAT THE AVERAGE TOTAL EMISSION RATE IS 1.7 MILLIROETGENS PER HOUR FOR THE QUANTITY TESTED. FIELD TESTS WERE SUCCESSFUL AND RADIOACTIVE TRACERS ARE NOW BEING USED AT SELECTED NEW LOCATIONS AND WHERE ORIGINAL POSITIONS HAVE BEEN DESTROYED. FIVE PROCEDURAL RECOMMENDATIONS FOR SAFETY AND HANDLING WERE DISCUSSED AND ADOPTED.

  • Supplemental Notes:
    • Vol 27, No 4, PP 613-619, 2 FIG
  • Authors:
    • Barker, H
  • Publication Date: 1967-12

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  • Accession Number: 00202632
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 12 1994 12:00AM