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11 Dec 2019

The half-life of cobalt-60 is 5.27 years, determine the following:

(a) the decay constant, in 1/s, of cobalt-60
____________________1/s

(b) the number of cobalt-60 atoms in a 2.58 µCi sample
_______________________________atoms

(c) how long it takes the sample from (b) to decrease to 1.54???105 atoms
________________________________yr

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Jamar Ferry
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13 Dec 2019

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Related questions

Cobalt-60, which undergoes beta decay, has a half-life of 5.26 yr. (a) How many beta particles are emitted in 600 s by a 3.75-mg sample of 60Co? (b) What is the activity of the sample in Bq?

Cobalt-60, which undergoes beta decay, has a half-life of5.26.

A) How many beta particles are emitted in 200 seconds by a 2.90 mgsample of {60}Co?

B) What is the activity of the sample in Bq?

I did the following two calculations:

Calculation of concentration (M) of 1 mL of cobalt (II) in diluted solution with 9 mL of deionized water

C1*V1 = C2*V2 (I)
0.1 M cobalt * 0.001 L cobalt = C2 * 0.01 L
C2 = (0.1 M * 0.001 L)/0.01 L = 0.01 M

Calculation of concentration (M) of unknown sample
Y = mx + b = 3.43x - 0.0094 (II)
X = (y-b)/m = (0.22+0.0094)/3.43 = 0.067 M

And I cannot figure out the final calculation:

Calculation of mg of cobalt in 1 kg of soil
M = moles/volume

I've attached a picture that could provide further context.

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