Federal regulations · Through 2026-08-25 · Newer source version available

28 CFR 79.31: Definitions.

(a) The definitions listed in § 79.11(b), (e), (f), (g), and (h), and in § 79.21, apply to this subpart.
(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.
(c) First exposure or initial exposure means the date on which the claimant first participated onsite in an atmospheric detonation of a nuclear device.
(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:
(1) For Operation Trinity, the period July 16, 1945, through August 6, 1945:
Event name Date Location
Trinity 07/16/45 Trinity Test Site
(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:
Event name Date Location
Able 07/01/46 Bikini
Baker 07/25/46 Bikini
(3) For Operation Sandstone, the period April 13, 1948, through May 20, 1948:
Event name Date Location
X-ray 04/15/48 Enewetak
Yoke 05/01/48 Enewetak
Zebra 05/15/48 Enewetak
(4) For Operation Ranger, the period January 27, 1951, through February 7, 1951:
Event name Date Location
Able 01/27/51 Nevada Test Site (“NTS”)
Baker 01/28/51 NTS
Easy 02/01/51 NTS
Baker-2 02/02/51 NTS
Fox 02/06/51 NTS
(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:
Event name Date Location
Dog 04/08/51 Enewetak
Easy 04/21/51 Enewetak
George 05/09/51 Enewetak
Item 05/25/51 Enewetak
(6) For Operation Buster-Jangle, the period October 22, 1951, through December 20, 1951:
Event name Date Location
Able 10/22/51 NTS
Baker 10/28/51 NTS
Charlie 10/30/51 NTS
Dog 11/01/51 NTS
Sugar 11/19/51 NTS
Uncle 11/29/51 NTS
(7) For Operation Tumbler-Snapper, the period April 1, 1952, through June 20, 1952:
Event name Date Location
Able 04/01/52 NTS
Baker 04/15/52 NTS
Charlie 04/22/52 NTS
Dog 05/01/52 NTS
Easy 05/07/52 NTS
Fox 05/25/52 NTS
George 06/01/52 NTS
(8) For Operation Ivy, the period October 29, 1952, through December 31, 1952:
Event name Date Location
Mike 11/01/52 Enewetak
King 11/16/52 Enewetak
(9) For Operation Upshot-Knothole, the period March 17, 1953, through June 20, 1953:
Event name Date Location
Annie 03/17/53 NTS
Nancy 03/24/53 NTS
Ruth 03/31/53 NTS
Dixie 04/06/53 NTS
Ray 04/11/53 NTS
Badger 04/18/53 NTS
Simon 04/25/53 NTS
Encore 05/08/53 NTS
Harry 05/19/53 NTS
Grable 05/25/53 NTS
Climax 06/04/53 NTS
(10) For Operation Castle, the period February 27, 1954, through May 31, 1954
Event name Date Location
Bravo 03/01/54 Bikini
Romeo 03/27/54 Bikini
Koon 04/07/54 Bikini
Union 04/26/54 Bikini
Yankee 05/05/54 Bikini
Nectar 05/14/54 Enewetak
(11) For Operation Teapot, the period February 18, 1955, through June 10, 1955:
Event name Date Location
Wasp 02/18/55 NTS
Moth 02/22/55 NTS
Tesla 03/01/55 NTS
Turk 03/07/55 NTS
Hornet 03/12/55 NTS
Bee 03/22/55 NTS
Ess 03/23/55 NTS
Apple-1 03/29/55 NTS
Wasp Prime 03/29/55 NTS
Ha 04/06/55 NTS
Post 04/09/55 NTS
Met 04/15/55 NTS
Apple-2 05/05/55 NTS
Zucchini 05/15/55 NTS
(12) For Operation Wigwam, the period May 14, 1955, through May 15, 1955:
Event name Date Location
Wigwam 05/14/55 Pacific
(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:
Event name Date Location
Lacrosse 05/05/56 Enewetak
Cherokee 05/21/56 Bikini
Zuni 05/28/56 Bikini
Yuma 05/28/56 Enewetak
Erie 05/31/56 Enewetak
Seminole 06/06/56 Enewetak
Flathead 06/12/56 Bikini
Blackfoot 06/12/56 Enewetak
Kickapoo 06/14/56 Enewetak
Osage 06/16/56 Enewetak
Inca 06/22/56 Enewetak
Dakota 06/26/56 Bikini
Mohawk 07/03/56 Enewetak
Apache 07/09/56 Enewetak
Navajo 07/11/56 Bikini
Tewa 07/21/56 Bikini
Huron 07/22/56 Enewetak
(14) For Operation Plumbbob, the period May 28, 1957, through October 22, 1957:
Event name Date Location
Boltzmann 05/28/57 NTS
Franklin 06/02/57 NTS
Lassen 06/05/57 NTS
Wilson 06/18/57 NTS
Priscilla 06/24/57 NTS
Hood 07/05/57 NTS
Diablo 07/15/57 NTS
John 07/19/57 NTS
Kepler 07/24/57 NTS
Owens 07/25/57 NTS
Stokes 08/07/57 NTS
Shasta 08/18/57 NTS
Doppler 08/23/57 NTS
Franklin Prime 08/30/57 NTS
Smoky 08/31/57 NTS
Galileo 09/02/57 NTS
Wheeler 09/06/57 NTS
Laplace 09/08/57 NTS
Fizeau 09/14/57 NTS
Newton 09/16/57 NTS
Whitney 09/23/57 NTS
Charleston 09/28/57 NTS
Morgan 10/07/57 NTS
(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:
Event name Date Location
Yucca 04/28/58 Pacific
Cactus 05/06/58 Enewetak
Fir 05/12/58 Bikini
Butternut 05/12/58 Enewetak
Koa 05/13/58 Enewetak
Wahoo 05/16/58 Enewetak
Holly 05/21/58 Enewetak
Nutmeg 05/22/58 Bikini
Yellowwood 05/26/58 Enewetak
Magnolia 05/27/58 Enewetak
Tobacco 05/30/58 Enewetak
Sycamore 05/31/58 Bikini
Rose 06/03/58 Enewetak
Umbrella 06/09/58 Enewetak
Maple 06/11/58 Bikini
Aspen 06/15/58 Bikini
Walnut 06/15/58 Enewetak
Linden 06/18/58 Enewetak
Redwood 06/28/58 Bikini
Elder 06/28/58 Enewetak
Oak 06/29/58 Enewetak
Hickory 06/29/58 Bikini
Sequoia 07/02/58 Enewetak
Cedar 07/03/58 Bikini
Dogwood 07/06/58 Enewetak
Poplar 07/12/58 Bikini
Scaevola 07/14/58 Enewetak
Pisonia 07/18/58 Enewetak
Juniper 07/22/58 Bikini
Olive 07/23/58 Enewetak
Pine 07/27/58 Enewetak
Teak 07/31/58 Johnston Isl
Qunice 08/06/58 Enewetak
Orange 08/11/58 Johnston Isl
Fig 08/18/58 Enewetak
(16) For Operation Argus, the period August 25, 1958, through September 10, 1958:
Event name Date Location
Argus I 08/27/58 South Atlantic
Argus II 08/30/58 South Atlantic
Argus III 09/06/58 South Atlantic
(17) For Operation Hardtack II, the period September 19, 1958, through October 31, 1958:
Event name Date Location
Eddy 09/19/58 NTS
Mora 09/29/58 NTS
Quay 10/10/58 NTS
Lea 10/13/58 NTS
Hamilton 10/15/58 NTS
Dona Ana 10/16/58 NTS
Rio Arriba 10/18/58 NTS
Socorro 10/22/58 NTS
Wrangell 10/22/58 NTS
Rushmore 10/22/58 NTS
Sanford 10/26/58 NTS
De Baca 10/26/58 NTS
Humboldt 10/29/58 NTS
Mazama 10/29/58 NTS
Santa Fe 10/30/58 NTS
(18) For Operation Dominic I, the period April 23, 1962, through December 31, 1962:
Event name Date Location
Adobe 04/25/62 Christmas Isl
Aztec 04/27/62 Christmas Isl
Arkansas 05/02/62 Christmas Isl
Questa 05/04/62 Christmas Isl
Frigate Bird 05/06/62 Pacific
Yukon 05/08/62 Christmas Isl
Mesilla 05/09/62 Christmas Isl
Muskegon 05/11/62 Christmas Isl
Swordfish 05/11/62 Pacific
Encino 05/12/62 Christmas Isl
Swanee 05/14/62 Christmas Isl
Chetco 05/19/62 Christmas Isl
Tanana 05/25/62 Christmas Isl
Nambe 05/27/62 Christmas Isl
Alma 06/08/62 Christmas Isl
Truckee 06/09/62 Christmas Isl
Yeso 06/10/62 Christmas Isl
Harlem 06/12/62 Christmas Isl
Rinconada 06/15/62 Christmas Isl
Dulce 06/17/62 Christmas Isl
Petit 06/19/62 Christmas Isl
Otowi 06/22/62 Christmas Isl
Bighorn 06/27/62 Christmas Isl
Bluestone 06/30/62 Christmas Isl
Starfish 07/08/62 Johnston Isl
Sunset 07/10/62 Christmas Isl
Pamlico 07/11/62 Christmas Isl
Androscoggin 10/02/62 Johnston Isl
Bumping 10/06/62 Johnston Isl
Chama 10/18/62 Johnston Isl
Checkmate 10/19/62 Johnston Isl
Bluegill 10/25/62 Johnston Isl
Calamity 10/27/62 Johnston Isl
Housatonic 10/30/62 Johnston Isl
Kingfish 11/01/62 Johnston Isl
Tightrope 11/03/62 Johnston Isl
(19) For Operation Dominic II, the period July 7, 1962, through August 15, 1962:
Event name Date Location
Little Feller II 07/07/62 NTS
Johnie Boy 07/11/62 NTS
Small Boy 07/14/62 NTS
Little Feller I 07/17/62 NTS
(20) For Operation Plowshare, the period July 6, 1962, through July 7, 1962, covering Project Sedan.

Where this section sits in the code

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

(a) The definitions listed in § 79.11(b), (e), (f), (g), and (h), and in § 79.21, apply to this subpart.

(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.

(c) First exposure or initial exposure means the date on which the claimant first participated onsite in an atmospheric detonation of a nuclear device.

(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:

(1) For Operation Trinity, the period July 16, 1945, through August 6, 1945:

Event name Date Location

Trinity 07/16/45 Trinity Test Site

(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:

Event name Date Location

Able 07/01/46 Bikini

Baker 07/25/46 Bikini

(3) For Operation Sandstone, the period April 13, 1948, through May 20, 1948:

Event name Date Location

X-ray 04/15/48 Enewetak

Yoke 05/01/48 Enewetak

Zebra 05/15/48 Enewetak

(4) For Operation Ranger, the period January 27, 1951, through February 7, 1951:

Event name Date Location

Able 01/27/51 Nevada Test Site (“NTS”)

Baker 01/28/51 NTS

Easy 02/01/51 NTS

Baker-2 02/02/51 NTS

Fox 02/06/51 NTS

(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:

Event name Date Location

Dog 04/08/51 Enewetak

Easy 04/21/51 Enewetak

George 05/09/51 Enewetak

Item 05/25/51 Enewetak

(6) For Operation Buster-Jangle, the period October 22, 1951, through December 20, 1951:

Event name Date Location

Able 10/22/51 NTS

Baker 10/28/51 NTS

Charlie 10/30/51 NTS

Dog 11/01/51 NTS

Sugar 11/19/51 NTS

Uncle 11/29/51 NTS

(7) For Operation Tumbler-Snapper, the period April 1, 1952, through June 20, 1952:

Event name Date Location

Able 04/01/52 NTS

Baker 04/15/52 NTS

Charlie 04/22/52 NTS

Dog 05/01/52 NTS

Easy 05/07/52 NTS

Fox 05/25/52 NTS

George 06/01/52 NTS

(8) For Operation Ivy, the period October 29, 1952, through December 31, 1952:

Event name Date Location

Mike 11/01/52 Enewetak

King 11/16/52 Enewetak

(9) For Operation Upshot-Knothole, the period March 17, 1953, through June 20, 1953:

Event name Date Location

Annie 03/17/53 NTS

Nancy 03/24/53 NTS

Ruth 03/31/53 NTS

Dixie 04/06/53 NTS

Ray 04/11/53 NTS

Badger 04/18/53 NTS

Simon 04/25/53 NTS

Encore 05/08/53 NTS

Harry 05/19/53 NTS

Grable 05/25/53 NTS

Climax 06/04/53 NTS

(10) For Operation Castle, the period February 27, 1954, through May 31, 1954

Event name Date Location

Bravo 03/01/54 Bikini

Romeo 03/27/54 Bikini

Koon 04/07/54 Bikini

Union 04/26/54 Bikini

Yankee 05/05/54 Bikini

Nectar 05/14/54 Enewetak

(11) For Operation Teapot, the period February 18, 1955, through June 10, 1955:

Event name Date Location

Wasp 02/18/55 NTS

Moth 02/22/55 NTS

Tesla 03/01/55 NTS

Turk 03/07/55 NTS

Hornet 03/12/55 NTS

Bee 03/22/55 NTS

Ess 03/23/55 NTS

Apple-1 03/29/55 NTS

Wasp Prime 03/29/55 NTS

Ha 04/06/55 NTS

Post 04/09/55 NTS

Met 04/15/55 NTS

Apple-2 05/05/55 NTS

Zucchini 05/15/55 NTS

(12) For Operation Wigwam, the period May 14, 1955, through May 15, 1955:

Event name Date Location

Wigwam 05/14/55 Pacific

(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:

Event name Date Location

Lacrosse 05/05/56 Enewetak

Cherokee 05/21/56 Bikini

Zuni 05/28/56 Bikini

Yuma 05/28/56 Enewetak

Erie 05/31/56 Enewetak

Seminole 06/06/56 Enewetak

Flathead 06/12/56 Bikini

Blackfoot 06/12/56 Enewetak

Kickapoo 06/14/56 Enewetak

Osage 06/16/56 Enewetak

Inca 06/22/56 Enewetak

Dakota 06/26/56 Bikini

Mohawk 07/03/56 Enewetak

Apache 07/09/56 Enewetak

Navajo 07/11/56 Bikini

Tewa 07/21/56 Bikini

Huron 07/22/56 Enewetak

(14) For Operation Plumbbob, the period May 28, 1957, through October 22, 1957:

Event name Date Location

Boltzmann 05/28/57 NTS

Franklin 06/02/57 NTS

Lassen 06/05/57 NTS

Wilson 06/18/57 NTS

Priscilla 06/24/57 NTS

Hood 07/05/57 NTS

Diablo 07/15/57 NTS

John 07/19/57 NTS

Kepler 07/24/57 NTS

Owens 07/25/57 NTS

Stokes 08/07/57 NTS

Shasta 08/18/57 NTS

Doppler 08/23/57 NTS

Franklin Prime 08/30/57 NTS

Smoky 08/31/57 NTS

Galileo 09/02/57 NTS

Wheeler 09/06/57 NTS

Laplace 09/08/57 NTS

Fizeau 09/14/57 NTS

Newton 09/16/57 NTS

Whitney 09/23/57 NTS

Charleston 09/28/57 NTS

Morgan 10/07/57 NTS

(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:

Event name Date Location

Yucca 04/28/58 Pacific

Cactus 05/06/58 Enewetak

Fir 05/12/58 Bikini

Butternut 05/12/58 Enewetak

Koa 05/13/58 Enewetak

Wahoo 05/16/58 Enewetak

Holly 05/21/58 Enewetak

Nutmeg 05/22/58 Bikini

Yellowwood 05/26/58 Enewetak

Magnolia 05/27/58 Enewetak

Tobacco 05/30/58 Enewetak

Sycamore 05/31/58 Bikini

Rose 06/03/58 Enewetak

Umbrella 06/09/58 Enewetak

Maple 06/11/58 Bikini

Aspen 06/15/58 Bikini

Walnut 06/15/58 Enewetak

Linden 06/18/58 Enewetak

Redwood 06/28/58 Bikini

Elder 06/28/58 Enewetak

Oak 06/29/58 Enewetak

Hickory 06/29/58 Bikini

Sequoia 07/02/58 Enewetak

Cedar 07/03/58 Bikini

Dogwood 07/06/58 Enewetak

Poplar 07/12/58 Bikini

Scaevola 07/14/58 Enewetak

Pisonia 07/18/58 Enewetak

Juniper 07/22/58 Bikini

Olive 07/23/58 Enewetak

Pine 07/27/58 Enewetak

Teak 07/31/58 Johnston Isl

Qunice 08/06/58 Enewetak

Orange 08/11/58 Johnston Isl

Fig 08/18/58 Enewetak

(16) For Operation Argus, the period August 25, 1958, through September 10, 1958:

Event name Date Location

Argus I 08/27/58 South Atlantic

Argus II 08/30/58 South Atlantic

Argus III 09/06/58 South Atlantic

(17) For Operation Hardtack II, the period September 19, 1958, through October 31, 1958:

Event name Date Location

Eddy 09/19/58 NTS

Mora 09/29/58 NTS

Quay 10/10/58 NTS

Lea 10/13/58 NTS

Hamilton 10/15/58 NTS

Dona Ana 10/16/58 NTS

Rio Arriba 10/18/58 NTS

Socorro 10/22/58 NTS

Wrangell 10/22/58 NTS

Rushmore 10/22/58 NTS

Sanford 10/26/58 NTS

De Baca 10/26/58 NTS

Humboldt 10/29/58 NTS

Mazama 10/29/58 NTS

Santa Fe 10/30/58 NTS

(18) For Operation Dominic I, the period April 23, 1962, through December 31, 1962:

Event name Date Location

Adobe 04/25/62 Christmas Isl

Aztec 04/27/62 Christmas Isl

Arkansas 05/02/62 Christmas Isl

Questa 05/04/62 Christmas Isl

Frigate Bird 05/06/62 Pacific

Yukon 05/08/62 Christmas Isl

Mesilla 05/09/62 Christmas Isl

Muskegon 05/11/62 Christmas Isl

Swordfish 05/11/62 Pacific

Encino 05/12/62 Christmas Isl

Swanee 05/14/62 Christmas Isl

Chetco 05/19/62 Christmas Isl

Tanana 05/25/62 Christmas Isl

Nambe 05/27/62 Christmas Isl

Alma 06/08/62 Christmas Isl

Truckee 06/09/62 Christmas Isl

Yeso 06/10/62 Christmas Isl

Harlem 06/12/62 Christmas Isl

Rinconada 06/15/62 Christmas Isl

Dulce 06/17/62 Christmas Isl

Petit 06/19/62 Christmas Isl

Otowi 06/22/62 Christmas Isl

Bighorn 06/27/62 Christmas Isl

Bluestone 06/30/62 Christmas Isl

Starfish 07/08/62 Johnston Isl

Sunset 07/10/62 Christmas Isl

Pamlico 07/11/62 Christmas Isl

Androscoggin 10/02/62 Johnston Isl

Bumping 10/06/62 Johnston Isl

Chama 10/18/62 Johnston Isl

Checkmate 10/19/62 Johnston Isl

Bluegill 10/25/62 Johnston Isl

Calamity 10/27/62 Johnston Isl

Housatonic 10/30/62 Johnston Isl

Kingfish 11/01/62 Johnston Isl

Tightrope 11/03/62 Johnston Isl

(19) For Operation Dominic II, the period July 7, 1962, through August 15, 1962:

Event name Date Location

Little Feller II 07/07/62 NTS

Johnie Boy 07/11/62 NTS

Small Boy 07/14/62 NTS

Little Feller I 07/17/62 NTS

(20) For Operation Plowshare, the period July 6, 1962, through July 7, 1962, covering Project Sedan.

Collected 2026-08-27T02:25:14Z. Source file · JSON

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