eae service and allowed the appeal. The Board said in pertinent part as ollows: The time element between the service, with exposure to radiation, CASE NO. 32 Type of Injury: Acute Myelocytic Leukemia. BVA’s Decision: Denial Reversed. Date of Decision: 1969. Appellant's Allegation: That veteran’s illness was caused by radiation exposure received while in the service. Facts: Veteran served from 1941 - 1961. During this period he participated in the Atomic Test Series at Indian Springs, Nevada, April to June 1952 and April to June 1953, and at Eniwetok and Bikini, Thermonuclear Test Series, May to and the recognition of the fatal disease is important. The independent medical expert has held that the interval from the veteran's most extensive exposure and development of leukemia was certainly not excessive, in view of known experience. We are not permitted to speculate in the matter of service connection for the cause of death. Decisions must be made on all of the available facts and circumstances in each case. The Board has considered the contention of the appellant concerning the quantity of radiation received by the veteran as compared with standards then and now in effect. Apart from a determination of whether the veteran did or did not receive an over-exposure of radiation, it is the opinion of the Board that the evidence is so evenly balanced in this particular case as to raise a substantial doubt, as distinguished from mere speculation, as to whether the disease causing the veteran’s death resulted from radiation exposure during wartime service. Such doubt must be resolved in favor of the claimant. June 1956. The record of the terminal hospitalization of the veteran shows age 49 and that he was admitted February 17, 1967, with complaints of headaches and bruises over the lower extremities and chest wall. The white blood count was elevated on admission. History given was of hypertension for one year and low-grade temperature for from | to 2 months. His hospital course was steadily downhill. Veteran died March 11, 1967. Diagnosis had been made of acute myelocytic leukemia, confirmed by bone marrow examination. Autopsy confirmed the diagnosis of acute myelocytic leukemia. The service medical records show an examination of the veteran with a penciled notation of dosage, May 1952, .23 and June 1952, .008. A report in May 1968 set forth that the veteran’s exposure up to August 1956 totaled 890 mR. Medical Evidence: The Board on its own motion submitted the case to an independent medical expert who expressed an opinion, in part, as follows: An interval of almost 11 years between the most extensive exposure and the development of leukemiais certainly not excessive in view of the experience among the Japanese atomic bomb survivors followed at ABCC. Although the peak incidence for radiation-related myelogenous leukemia of both the acute and chronic varieties apparently passed some time ago, the prevalence in proximally exposed survivors still exceeds that in the general Japanese population almost 24 years after the explosions. Findings of the BVA and Basis for Decision: In finding that the veteran was exposed to ionizing radiation on occasion from 1952 to 1956 during service, the Board concluded that feukemia had its inception during the veteran’s 100 101