Question

Activity of 1 gm of radium (226) is 1ci . What is
half life?
(1) 1600 year
(2) 1087 year
(3) 540 year
(4)5770 year
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Answer 1

Answer:

1600

Explanation:

In radium: Occurrence, properties, and uses …known; their half-lives, except for radium-226 (1,600 years) and radium-228 (5.75 years), are less than a few weeks. The long-lived radium-226 is found in nature as a result of its continuous formation from uranium-238 decay.