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4. a) Co" has a half-life of 5.2 years. i. Calculate the disintegration constant? ii. Calculate the activity of a 1-gram sample of Co", and express this activity in Curies.

4. a) Co" has a half-life of 5.2 years. i. Calculate the disintegration constant? ii. Calculate the activity of a 1-gram sample of Co", and express this activity in Curies.

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4. a) Co60 has a half-life of 5.2 years. i. Calculate the disintegration constant? ii. Calculate the activity of a 1-gram sample of Co®, and express this activity in Curies. b) If the half-life of Nd144 is 2.4x10'5 years, how long does it take for Nd'44 to drop to 10 % of its initial activity? NA= 6.02x1023 atoms/mol ,MA (Co0) = 59.93 g/mol , MẠ (Nd144)= 143.91 g/mol
Transcribed Image Text:4. a) Co60 has a half-life of 5.2 years. i. Calculate the disintegration constant? ii. Calculate the activity of a 1-gram sample of Co®, and express this activity in Curies. b) If the half-life of Nd144 is 2.4x10'5 years, how long does it take for Nd'44 to drop to 10 % of its initial activity? NA= 6.02x1023 atoms/mol ,MA (Co0) = 59.93 g/mol , MẠ (Nd144)= 143.91 g/mol
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