A Special Exposure Cohort class is a group of employees for whom it has been determined that accurate dose reconstruction can not be calculated. Thus, radiation becomes the presumptive cause of the cancer. 

Listed below are the Special Exposure Cohort work sites.
Name of DOE Work Site // SEC Covered Work Period // Location:
Allied Chemical, 1-1-59 to 12-31-76 Metropolis, Il
Amchitka Island, AK, prior to 1974, one day presence, Long Shot, Milrow, Cannikin tests
Ames Laboratory, Iowa State Univ., 8-13-42 to 12-31-70 Ames, IA
Argonne National Laboratory-West, 4-10-1951 to 12-31-1957 Scoville, ID

Atomics International (NAA) sites:
   Canoga Avenue (Vanowen Bldg), 1-1-55 to 12-31-60 Canoga Park, CA
   DeSoto Avenue, 1-1-59 to 12-31-64 Canoga Park, CA
   Downey Facility (Vandegraaf Gen), 1-1-48 to 12-31-55 Downey, CA
   Santa Susana Field Lab, Area IV (ETEC), 1-1-55 to 12-31-88 Simi Valley, CA

Baker Brothers, 6-1-43 to 12-31-44 Toledo, OH
Battelle Labs, King Avenue, 4-16-43 to 6-30-56 Columbus, OH
Bethlehem Steel, 1-1-49 to 12-31-52 Lackawanna, NY
Blockson Chemical, 3-1-51 to 6-30-60 Joliet, IL
Brookhaven National Laboratory, 1-1-47 to 12-31-93 Upton, NY
BWX Technologies, 1-1-85 to 11-30-94 Lynchburg, VA
BWX Technologies, 1-1-68 to 12-31-72 Lynchburg, VA
BWX Technologies, 1-1-59 to 12-31-59 Lynchburg, VA

Clarksville Modification Center, 8-1-49 to 12-31-67 Clarksville, TN
Combustion Engineering, 1-1-65 to 12-31-72 Windsor, CT
Connecticut Aircraft Nuclear Engine Laboratory (CANEL), 1-1-58 to 12-31-65 Middletown, CT
Dow Chemical, 1-1-57 to 12-31-60 Madison, IL
Dow Chemical, 10-1-47 to 6-30-57 Pittsburg, CA

Electro Metallurgical, 8-13-42 to 12-31-47 Niagara Falls, NY
Feed Material Production Center, NLO & AEC, 1-1-54 to 12-31-78 Fernald, OH
Feed Material Production Center, 1-1-51 to 12-31-83 (non NLO workers)  Fernald, OH

General Atomics, 1-1-60 to 12-31-69 La Jolla, CA
General Electric, (Air Force Plant 36, Nuclear) 1-1-61 to 6-30-70 Evendale, OH
Grand Junction Operations (AEC-DOE), 3-23-43 to 12-31-85 Grand Junction, CO
Hanford/Hanford Engineer Works (includes PNNL), 10-1-43 to 12-31-83 Richland, WA
Hanford/Hanford Engineer Works - Select Employers - 1-1-84 to 12-31-90 Richland, WA, includes Kaiser, J.A. Jones and certain sub-contractors.  There are employer exclusions.

Harshaw Chemical-Harvard-Denison, 8-14-42 to 11-30-49 Cleveland, OH
Horizons, 1-1-52 to 12-31-56 Cleveland, OH

Idaho National Laboratory - 3-1-70 to 12-31-74, one dosimeter read, Scoville, ID

Idaho National Laboratory - 1-1-75 to 12-31-80, one dosimeter read from CPP, Scoville, ID

Iowa Ordnance Plant (IAAP), Line 1, 5-1-48 to 3-31-49 Burlington, IA
Iowa Ordnance Plant (IAAP), Line 1, radiographers, 3-1-49 to 12-31-74 Burlington, IA
Joslyn Manufacturing & Supply, 3-1-43 to 12-31-1047 Ft Wayne, IN
Kellex/Pierpont, 1-1-43 to 12-31-53 Jersey City, NJ

Lake Ontario Ordnance Works (LOOW), 1-1-44 to 12-31-53 Youngstown, NY
Lawrence Berkeley National Laboratory, 8-13-42 to 12-31-61 Berkeley, CA
Lawrence Livermore National Laboratory, 1-1-50 to 12-31-89 Livermore, CA
Linde Ceramics, 10-1-42 to 12-31-69 Tonawanda, NY
Los Alamos National Laboratory, 3-14-43 to 12-31-95 Los Alamos, NM

Mallinckrodt Chemical Works, 1-1-42 to 12-31-58 St. Louis, MO
Medina Modification Center, 1-1-58 to 12-31-66 San Antonio, TX
Metals and Controls, 1-1-52 to 12-31-67 Attleboro, MA
Metallurgical Lab, 8-13-42 –6-30-46 Chicago, IL
MIT, Hood Building, 3-9-46 to 12-31-63 Cambridge, MA
Monsanto Chemical, 1-1-1943 to 12-31-49 Dayton, OH
Mound Plant, 10-1-49 to 12-31-07 Miamisburg, OH

Nevada Test Site 1-27-51 to 1-31-92 Mercury, Nevada
Norton, 1-1-45 to 10-10-62 Worcester, MA
Nuclear Materials & Equipment (NUMEC), 1-1-57 to 12-31-83 Apollo, PA
Nuclear Materials &  Equipment (NUMEC), 6-1-60 to 12-31-80 Parks Township, PA
Nuclear Metals, 10-29-58 to 12-31-79 Concord, MA

Oak Ridge, TN sites:
   Y-12 National Security Complex, 3-1-43 to 12-31-57
   X-10 Oak Ridge National Lab, 6-17-43 to 7-31-55
   K-25 Gaseous Diffusion Plant, 9-1-44 to 12-31-87
   S-50 Thermal Diffusion Plant 7-9-44 to 12-31-51
   Oak Ridge Hospital 5-15-50 to 12-31-59
   Oak Ridge Institute for Nuclear Studies (ORINS) 5-15-50 to 12-31-63
   Clinton Engineer Works, 1-1-43 to 12-31-49

Pacific Proving Grounds 1-1-46 to 12-31-62, Eniwetok, Bikini, Christmas & Johnson
Paducah Gaseous Diffusion Plant, 7-1-52 to 2-1-92, Paducah, KY
Pantex, 1-1-51 to 12-31-91 Amarillo, TX
Piqua Organic Moderated Reactor Site, 5-2-66 to 2-28-69, Piqua, OH
Portsmouth Gaseous Diffusion Plant, 9-1-54 to 2-11-92, Piketon, OH
Revere Copper and Brass, 7-24-43 to 12-31-54, Detroit, MI
Rocky Flats Weapons Plant, 4-1-52 to 12-31-83 Denver-Boulder, CO

Sandia National Laboratories, 1-1-49 to 12-31-94 Albuquerque, NM
Sandia National Laboratories, 10-1-57 to 12-31-94 Livermore, CA
Savannah River Site, 1-1-53 to 9-30-72 Aiken, SC
Simonds Saw and Steel, 1-1-48 to 12-31-57 Lockport, NY
Spencer Chemical/Jayhawk Works, 1-1-56 to 12-31-61 Pittsburg, KS
St. Louis Airport Storage, 1-3-47 to 11-2-71 St. Louis, MO
Standard Oil Development, 8-13-42 to 12-31-45 Linden, NJ

Texas City Chemicals, 10-5-53 to 9-30-55, Texas City, TX
Tyson Valley Powder Farm, 2-13-46 to 6-30-48, Eureka, MO
University of Chicago, Metallurgical Laboratory, 8-13-42 to 6-30-46 Chicago, IL
University of Rochester Atomic Energy Project, 9-1-43 to 10-30-71 Rochester, NY
Ventron, 11-1-42 to 12-31-48 Beverly, MA
Vitro Manufacturing, 8-13-42 to 9-30-65 Canonsburg, PA

W.R. Grace, Curtis Bay, 5-1-56 to 1-31-58 Curtis Bay, MD
W.R. Grace, Erwin, 1-1-58 to 12-31-70 Erwin, TN
Wah Chang, 1-1-71 to 12-31-72 Albany, OR
Westinghouse Atomic Power Development Plant, 8-13-42 to 12-31-44 Pittsburg, PA
Westinghouse Electric, 8-13-42 to 12-31-49, Bloomfield, NJ
Westinghouse Electric, 2-1-58 to 6-30-59, Bloomfield, NJ

Winchester Engineering and Analytical Center, 1-1-52 to 12-31-61 Winchester, MA

Special Exposure Cohort - SEC Sites

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