World War II aircraft had instruments with glowing radium-painted dials (see Figure 31.2). The activity of one
Question:
World War II aircraft had instruments with glowing radium-painted dials (see Figure 31.2). The activity of one such instrument was 1.0 x 105 Bq when new.
(a) What mass of 226Ra was present?
(b) After some years, the phosphors on the dials deteriorated chemically, but the radium did not escape. What is the activity of this instrument 57.0 years after it was made?
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a The radium226 isotope has a halflife of 57 years So ...View the full answer
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