_Estimated dose rate at D+] Milliroentgens per hour (Dunning, 1957) lO J , \ | Operation N\! Gamma Dose Rates on | J . Hardtack \! \ Kabelle Island —— Theoretical decay Tl \ \ \ —— Theoretical decay of U2** fission products as measured by the AN/PDR-39 (TIB) radiac at 3 . feet above an infinite plane lo’ J (Miller and Loeb, 1958) ' J IO 10? ee $5 ‘36 'S7 SaSOEIES qT 10° Days after March 1,1954 and March 1 of each year indicated Fig. 3. Decline of Gamma Dose Rates at Kabelle Islet. 14 lO

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