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Chapter 5: Q.5.74 (page 165)

The activity of C-14 in a 70kg human body is estimated to be 3.7 kBq. What is this activity in microcuries?

Short Answer

Expert verified

The activity is $1 \times 10^{- 4} mCi$

Step by step solution

01

Given Information

The activity of C- $14$ in a $70$ kg human body is estimated to be $3.7$ kBq.

02

Explanation

Converting to mCi,

$3.7 kBq \times \frac{1 mCi}{37000 kBq} = 1 \times 10^{- 4} mCi$

Hence the activity is $1 \times 10^{- 4} mCi$

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Most popular questions from this chapter

For each of the following, indicate if the number of half-lives elapsed is:

$1 .$ one half-life

$2 .$ two half-lives

$3 .$ three half-lives

a. a sample of $P d - 103$ with a half-life of role="math" localid="1652183772347" $17 d a y s$ after role="math" localid="1652183747511" $34 d a y s$

b. a sample of $C - 11$ with a half-life of role="math" localid="1652183784933" $20 m i n s$ after role="math" localid="1652183731846" $20 m i n$

c. a sample of $A t - 211$ with a half-life of $7 h$ after $21 h$

Calcium- $47$ , used to evaluate bone metabolism, has a half-life of $4.5$ days. $(5.2, 5.4)$

a. Write the balanced nuclear equation for the beta decay of calcium- $47$ .

b. How many milligrams of a $16 - m g$ sample of calcium- $47$ remain after $18$ days?

c. How many days have passed if $4.8 mg$ of calcium- $47$ decayed to $1.2 mg$ of calcium- $47$ ?

How does a chain reaction occur in nuclear fission?

Identify each of the following as alpha decay, beta decay, positron emission, or gamma emission: $(5.1, 5.2)$

a. ${}_{13}^{27 m} Al ⟶ \frac{27}{13} Al + {}_{0}^{0}γ$

b. ${}_{5}^{8}B \to {}_{4}^{8}{Be} + {}_{- 1}^{0}e$

c. ${}_{86}^{220}{Rn} ⟶ {}_{84}^{216}{Po} + {}_{2}^{4}{Hc}$

A $64 - μCi$ sample of $T l - 201$ decays to $4.0 μ Ci$ in $12$ days. What is the half-life, in days, of $T l - 201$ ? $(5.3, 5.4)$

See all solutions

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