{"data":{"id":"us/28-cfr-79.31","jurisdiction":"us","citation":"28 CFR 79.31","heading":"Definitions.","body":"(a) The definitions listed in § 79.11(b), (e), (f), (g), and (h), and in § 79.21, apply to this subpart.\n(b) Atmospheric detonation of a nuclear device means only a test conducted by the United States prior to January 1, 1963, as listed in paragraph (d) of this section.\n(c) First exposure or initial exposure means the date on which the claimant first participated onsite in an atmospheric detonation of a nuclear device.\n(d) Period of atmospheric nuclear testing means one of the periods listed in this paragraph that are associated with each test operation, plus an additional six-month period thereafter:\n(1) For Operation Trinity, the period July 16, 1945, through August 6, 1945:\nEvent name Date Location\nTrinity 07/16/45 Trinity Test Site\n(2) For Operation Crossroads, the period June 28, 1946, through August 31, 1946, for all activities other than the decontamination of ships involved in Operation Crossroads; the period of atmospheric nuclear testing for the decontamination of ships involved in Operation Crossroads shall run from June 28, 1946, through November 30, 1946:\nEvent name Date Location\nAble 07/01/46 Bikini\nBaker 07/25/46 Bikini\n(3) For Operation Sandstone, the period April 13, 1948, through May 20, 1948:\nEvent name Date Location\nX-ray 04/15/48 Enewetak\nYoke 05/01/48 Enewetak\nZebra 05/15/48 Enewetak\n(4) For Operation Ranger, the period January 27, 1951, through February 7, 1951:\nEvent name Date Location\nAble 01/27/51 Nevada Test Site (“NTS”)\nBaker 01/28/51 NTS\nEasy 02/01/51 NTS\nBaker-2 02/02/51 NTS\nFox 02/06/51 NTS\n(5) For Operation Greenhouse, the period April 5, 1951, through June 20, 1951, for all activities other than service as a member of the garrison or maintenance forces on the atoll of Enewetak between June 21, 1951, and July 1, 1952; the period of atmospheric nuclear testing for service as a member of the garrison or maintenance forces on the atoll of Enewetak shall run from April 5, 1951, through July 1, 1952:\nEvent name Date Location\nDog 04/08/51 Enewetak\nEasy 04/21/51 Enewetak\nGeorge 05/09/51 Enewetak\nItem 05/25/51 Enewetak\n(6) For Operation Buster-Jangle, the period October 22, 1951, through December 20, 1951:\nEvent name Date Location\nAble 10/22/51 NTS\nBaker 10/28/51 NTS\nCharlie 10/30/51 NTS\nDog 11/01/51 NTS\nSugar 11/19/51 NTS\nUncle 11/29/51 NTS\n(7) For Operation Tumbler-Snapper, the period April 1, 1952, through June 20, 1952:\nEvent name Date Location\nAble 04/01/52 NTS\nBaker 04/15/52 NTS\nCharlie 04/22/52 NTS\nDog 05/01/52 NTS\nEasy 05/07/52 NTS\nFox 05/25/52 NTS\nGeorge 06/01/52 NTS\n(8) For Operation Ivy, the period October 29, 1952, through December 31, 1952:\nEvent name Date Location\nMike 11/01/52 Enewetak\nKing 11/16/52 Enewetak\n(9) For Operation Upshot-Knothole, the period March 17, 1953, through June 20, 1953:\nEvent name Date Location\nAnnie 03/17/53 NTS\nNancy 03/24/53 NTS\nRuth 03/31/53 NTS\nDixie 04/06/53 NTS\nRay 04/11/53 NTS\nBadger 04/18/53 NTS\nSimon 04/25/53 NTS\nEncore 05/08/53 NTS\nHarry 05/19/53 NTS\nGrable 05/25/53 NTS\nClimax 06/04/53 NTS\n(10) For Operation Castle, the period February 27, 1954, through May 31, 1954\nEvent name Date Location\nBravo 03/01/54 Bikini\nRomeo 03/27/54 Bikini\nKoon 04/07/54 Bikini\nUnion 04/26/54 Bikini\nYankee 05/05/54 Bikini\nNectar 05/14/54 Enewetak\n(11) For Operation Teapot, the period February 18, 1955, through June 10, 1955:\nEvent name Date Location\nWasp 02/18/55 NTS\nMoth 02/22/55 NTS\nTesla 03/01/55 NTS\nTurk 03/07/55 NTS\nHornet 03/12/55 NTS\nBee 03/22/55 NTS\nEss 03/23/55 NTS\nApple-1 03/29/55 NTS\nWasp Prime 03/29/55 NTS\nHa 04/06/55 NTS\nPost 04/09/55 NTS\nMet 04/15/55 NTS\nApple-2 05/05/55 NTS\nZucchini 05/15/55 NTS\n(12) For Operation Wigwam, the period May 14, 1955, through May 15, 1955:\nEvent name Date Location\nWigwam 05/14/55 Pacific\n(13) For Operation Redwing, the period May 2, 1956, through August 6, 1956, for all activities other than service as a member of the garrison or maintenance forces on the atoll of Enewetak from August 7, 1956, through August 7, 1957; the period of atmospheric nuclear testing for service as a member of the garrison or maintenance forces on the atoll of Enewetak shall run from May 2, 1956, through August 7, 1957:\nEvent name Date Location\nLacrosse 05/05/56 Enewetak\nCherokee 05/21/56 Bikini\nZuni 05/28/56 Bikini\nYuma 05/28/56 Enewetak\nErie 05/31/56 Enewetak\nSeminole 06/06/56 Enewetak\nFlathead 06/12/56 Bikini\nBlackfoot 06/12/56 Enewetak\nKickapoo 06/14/56 Enewetak\nOsage 06/16/56 Enewetak\nInca 06/22/56 Enewetak\nDakota 06/26/56 Bikini\nMohawk 07/03/56 Enewetak\nApache 07/09/56 Enewetak\nNavajo 07/11/56 Bikini\nTewa 07/21/56 Bikini\nHuron 07/22/56 Enewetak\n(14) For Operation Plumbbob, the period May 28, 1957, through October 22, 1957:\nEvent name Date Location\nBoltzmann 05/28/57 NTS\nFranklin 06/02/57 NTS\nLassen 06/05/57 NTS\nWilson 06/18/57 NTS\nPriscilla 06/24/57 NTS\nHood 07/05/57 NTS\nDiablo 07/15/57 NTS\nJohn 07/19/57 NTS\nKepler 07/24/57 NTS\nOwens 07/25/57 NTS\nStokes 08/07/57 NTS\nShasta 08/18/57 NTS\nDoppler 08/23/57 NTS\nFranklin Prime 08/30/57 NTS\nSmoky 08/31/57 NTS\nGalileo 09/02/57 NTS\nWheeler 09/06/57 NTS\nLaplace 09/08/57 NTS\nFizeau 09/14/57 NTS\nNewton 09/16/57 NTS\nWhitney 09/23/57 NTS\nCharleston 09/28/57 NTS\nMorgan 10/07/57 NTS\n(15) For Operation Hardtack I, the period April 26, 1958, through October 31, 1958, for all activities other than service as a member of the garrison or maintenance forces on the atoll of Enewetak from November 1, 1958, through April 30, 1959; the period of atmospheric nuclear testing for service as a member of the garrison or maintenance forces on the atoll of Enewetak shall run from April 26, 1958, through April 30, 1959:\nEvent name Date Location\nYucca 04/28/58 Pacific\nCactus 05/06/58 Enewetak\nFir 05/12/58 Bikini\nButternut 05/12/58 Enewetak\nKoa 05/13/58 Enewetak\nWahoo 05/16/58 Enewetak\nHolly 05/21/58 Enewetak\nNutmeg 05/22/58 Bikini\nYellowwood 05/26/58 Enewetak\nMagnolia 05/27/58 Enewetak\nTobacco 05/30/58 Enewetak\nSycamore 05/31/58 Bikini\nRose 06/03/58 Enewetak\nUmbrella 06/09/58 Enewetak\nMaple 06/11/58 Bikini\nAspen 06/15/58 Bikini\nWalnut 06/15/58 Enewetak\nLinden 06/18/58 Enewetak\nRedwood 06/28/58 Bikini\nElder 06/28/58 Enewetak\nOak 06/29/58 Enewetak\nHickory 06/29/58 Bikini\nSequoia 07/02/58 Enewetak\nCedar 07/03/58 Bikini\nDogwood 07/06/58 Enewetak\nPoplar 07/12/58 Bikini\nScaevola 07/14/58 Enewetak\nPisonia 07/18/58 Enewetak\nJuniper 07/22/58 Bikini\nOlive 07/23/58 Enewetak\nPine 07/27/58 Enewetak\nTeak 07/31/58 Johnston Isl\nQunice 08/06/58 Enewetak\nOrange 08/11/58 Johnston Isl\nFig 08/18/58 Enewetak\n(16) For Operation Argus, the period August 25, 1958, through September 10, 1958:\nEvent name Date Location\nArgus I 08/27/58 South Atlantic\nArgus II 08/30/58 South Atlantic\nArgus III 09/06/58 South Atlantic\n(17) For Operation Hardtack II, the period September 19, 1958, through October 31, 1958:\nEvent name Date Location\nEddy 09/19/58 NTS\nMora 09/29/58 NTS\nQuay 10/10/58 NTS\nLea 10/13/58 NTS\nHamilton 10/15/58 NTS\nDona Ana 10/16/58 NTS\nRio Arriba 10/18/58 NTS\nSocorro 10/22/58 NTS\nWrangell 10/22/58 NTS\nRushmore 10/22/58 NTS\nSanford 10/26/58 NTS\nDe Baca 10/26/58 NTS\nHumboldt 10/29/58 NTS\nMazama 10/29/58 NTS\nSanta Fe 10/30/58 NTS\n(18) For Operation Dominic I, the period April 23, 1962, through December 31, 1962:\nEvent name Date Location\nAdobe 04/25/62 Christmas Isl\nAztec 04/27/62 Christmas Isl\nArkansas 05/02/62 Christmas Isl\nQuesta 05/04/62 Christmas Isl\nFrigate Bird 05/06/62 Pacific\nYukon 05/08/62 Christmas Isl\nMesilla 05/09/62 Christmas Isl\nMuskegon 05/11/62 Christmas Isl\nSwordfish 05/11/62 Pacific\nEncino 05/12/62 Christmas Isl\nSwanee 05/14/62 Christmas Isl\nChetco 05/19/62 Christmas Isl\nTanana 05/25/62 Christmas Isl\nNambe 05/27/62 Christmas Isl\nAlma 06/08/62 Christmas Isl\nTruckee 06/09/62 Christmas Isl\nYeso 06/10/62 Christmas Isl\nHarlem 06/12/62 Christmas Isl\nRinconada 06/15/62 Christmas Isl\nDulce 06/17/62 Christmas Isl\nPetit 06/19/62 Christmas Isl\nOtowi 06/22/62 Christmas Isl\nBighorn 06/27/62 Christmas Isl\nBluestone 06/30/62 Christmas Isl\nStarfish 07/08/62 Johnston Isl\nSunset 07/10/62 Christmas Isl\nPamlico 07/11/62 Christmas Isl\nAndroscoggin 10/02/62 Johnston Isl\nBumping 10/06/62 Johnston Isl\nChama 10/18/62 Johnston Isl\nCheckmate 10/19/62 Johnston Isl\nBluegill 10/25/62 Johnston Isl\nCalamity 10/27/62 Johnston Isl\nHousatonic 10/30/62 Johnston Isl\nKingfish 11/01/62 Johnston Isl\nTightrope 11/03/62 Johnston Isl\n(19) For Operation Dominic II, the period July 7, 1962, through August 15, 1962:\nEvent name Date Location\nLittle Feller II 07/07/62 NTS\nJohnie Boy 07/11/62 NTS\nSmall Boy 07/14/62 NTS\nLittle Feller I 07/17/62 NTS\n(20) For Operation Plowshare, the period July 6, 1962, through July 7, 1962, covering Project Sedan.","path":["Title 28—Judicial Administration","CHAPTER I—DEPARTMENT OF JUSTICE","PART 79—CLAIMS UNDER THE RADIATION EXPOSURE COMPENSATION ACT","Subpart D—Eligibility Criteria for Claims by Onsite Participants"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-28.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:14Z","sha256":"48d5dcc38a7a011b756528b53645b9a69be7d9600db1c073dc0304b10b0640a5","source_id":"us-cfr","stale":true,"prev":"us/28-cfr-79.30","next":"us/28-cfr-79.32"},"notice":"GroundRules: Original legal text. Not legal advice."}