---
kind: "section"
citation: "28 C.F.R. § 79.31"
title: "28"
number: "79.31"
heading: "Definitions."
url: "https://uscodex.org/cfr/28/79.31"
---

# §79.31. Definitions.

- (a) The definitions listed in § [79.11(b)](/cfr/28/79.11.md?p=b), [(e)](/cfr/28/79.11.md?p=e), [(f)](/cfr/28/79.11.md?p=f), [(g)](/cfr/28/79.11.md?p=g), and [(h)](/cfr/28/79.11.md?p=h), and in [§ 79.21](/cfr/28/79.21.md), 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)](#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—**
  - (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:
  - (3) **For Operation Sandstone, the period April 13, 1948, through May 20, 1948—**
  - (4) **For Operation Ranger, the period January 27, 1951, through February 7, 1951—**
  - (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:
  - (6) **For Operation Buster-Jangle, the period October 22, 1951, through December 20, 1951—**
  - (7) **For Operation Tumbler-Snapper, the period April 1, 1952, through June 20, 1952—**
  - (8) **For Operation Ivy, the period October 29, 1952, through December 31, 1952—**
  - (9) **For Operation Upshot-Knothole, the period March 17, 1953, through June 20, 1953—**
  - (10) For Operation Castle, the period February 27, 1954, through May 31, 1954
  - (11) **For Operation Teapot, the period February 18, 1955, through June 10, 1955—**
  - (12) **For Operation Wigwam, the period May 14, 1955, through May 15, 1955—**
  - (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:
  - (14) **For Operation Plumbbob, the period May 28, 1957, through October 22, 1957—**
  - (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:
  - (16) **For Operation Argus, the period August 25, 1958, through September 10, 1958—**
  - (17) **For Operation Hardtack II, the period September 19, 1958, through October 31, 1958—**
  - (18) **For Operation Dominic I, the period April 23, 1962, through December 31, 1962—**
  - (19) **For Operation Dominic II, the period July 7, 1962, through August 15, 1962—**
  - (20) **For Operation Plowshare, the period July 6, 1962, through July 7, 1962, covering Project Sedan.**

## Notes

### Authority

Authority: Secs. 6(a), 6(i) and 6(j), Pub. L. 101-426, 104 Stat. 920, as amended by secs. 3(c)-(h), Pub. L. 106-245, 114 Stat. 501 and sec. 11007, Pub. L. 107-273, 116 Stat. 1758 (42 U.S.C. 2210 note; 5 U.S.C. 500(b)).

### Source

Source: Order No. 2711-2004, 69 FR 13634, Mar. 23, 2004, unless otherwise noted.