A theoretical and experimental program was undertaken to evaluate the feasibility of using radioluminescent light sources (with hydrogen-3 or krypton-85) as roadway lane markers. Simulated markers using ultraviolet light stimulation and a ribbed coverplate to counteract Fresnel losses were built and matched to the luminance of actual radioluminescent materials. The radioactivity required to fabricate a comparable single marker is estimated to be 240 curies of hydrogen-3. The luminance when viewed at 1.5 deg, is approximately 1.2 scotopic footlambert (4.1 scotopic cd/sq m). Subjective visibility tests of simulated radioluminescent markers using observers in an instrument test vehicle established the visibility of a dry marker as 350 ft (107 m) and of a wet marker as 275 ft (84 m). These values are greater than the visibility distance for a paint stripe or used retroreflector but are less than the values for a new retroreflector. Radioluminescent markers using hydrogen-3 are therefore sufficiently bright but costs ($1.00 per curie) are high and there is a potential for radiation overexposure in an accident situation at a stockpile or storage facility. /FHWA/

  • Corporate Authors:

    IIT Research Institute

    10 West 35th Street
    Chicago, IL  United States  60616
  • Authors:
    • Semmler, R A
    • Viergutz, O J
    • Wakely, H G
    • Wilner, K
    • Betz, H
  • Publication Date: 1976-8

Media Info

  • Pagination: 105 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00179504
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-RD-77-115 Final Rpt., FCP 31I1-123
  • Files: TRIS, USDOT
  • Created Date: Aug 27 1978 12:00AM