Q: Which of the following is the correct relationship between the units of radiation measurement: curie (Ci), becquerel (Bq), rad, gray (Gy), rem, and sievert (Sv)?

1 Ci = $$3.7 \times 10$$^{10}$$ Bq; 1 Gy = 100 rad; 1 Sv = 100 rem

Question 1

Which of the following statements best describes the difference between alpha, beta, and gamma radiation in terms of their penetration abilities and required shielding?

Accepted Answer

Alpha particles are stopped by paper or clothing, beta particles require heavy clothing or lab coats, and gamma rays require lead or thick concrete for shielding.

Question 2

A hospital uses technetium-99m ($$^{99m}_{43}\mathrm{Tc}) $$for imaging. Which property makes this isotope especially suitable for medical imaging?

Accepted Answer

It emits gamma rays and has a short half-life, minimizing patient exposure while providing clear images.

Question 3

Which balanced nuclear equation represents the beta decay of cobalt-60 ($$^{60}_{27}\mathrm{Co}$$)?

Accepted Answer

$$^{60}_{27}\mathrm{Co} \$$rightarrow ^{60}$$_{28}\mathrm{Ni} $$+ ^{0}$$_{-1}\mathrm{e}$$

Question 4

A sample contains 64 mg of iodine-123 ($$^{123}_{53}\mathrm{I}$$), which has a half-life of 13.2 hours. How much remains after 26.4 hours?

Accepted Answer

16 mg

Question 5

Which of the following nuclear equations is correctly balanced for the alpha decay of americium-241 ($$^{241}_{95}\mathrm{Am}$$)?

Accepted Answer

$$^{241}_{95}\mathrm{Am} \$$rightarrow ^{237}$$_{93}\mathrm{Np} $$+ ^{4}$$_{2}\mathrm{He}$$

Question 6

Which unit is used to measure the biological effect of radiation on humans?

Accepted Answer

Rem (or sievert, Sv)

Question 7

A patient receives a dose of 0.5 Gy of alpha radiation. What is the equivalent dose in sieverts (Sv), given that the quality factor for alpha particles is 20?

Accepted Answer

$$0.5 	imes 20 = 10 Sv$$

Question 8

Which of the following best explains why radioisotopes with short half-lives are preferred for diagnostic imaging in nuclear medicine?

Accepted Answer

They decay quickly, minimizing radiation exposure to the patient.

Question 9

Which process is described by the equation $$^{235}_{92}\mathrm{U} $$+ ^{1}$$_{0}\mathrm{n} \$$rightarrow ^{91}$$_{36}\mathrm{Kr} $$+ ^{142}$$_{56}\mathrm{Ba} + 3\ ^{1}_{0}\mathrm{n}$$?

Accepted Answer

Nuclear fission

Question 10

A bone sample from an ancient skeleton contains 25% of the original carbon-14 activity. If the half-life of carbon-14 is 5730 years, approximately how old is the bone?

Accepted Answer

11,460 years

Question 11

Which of the following statements about nuclear fusion is correct?

Accepted Answer

It combines small nuclei into larger nuclei, releasing large amounts of energy.

Question 12

Which of the following is a real-world application of gamma radiation?

Accepted Answer

Sterilizing medical equipment and irradiating food to kill bacteria.

Question 13

A positron emission is represented by which of the following nuclear equations?

Accepted Answer

$$^{49}_{25}\mathrm{Mn} \$$rightarrow ^{49}$$_{24}\mathrm{Cr} $$+ ^{0}$$_{+1}\mathrm{e}$$

Question 14

Which of the following best describes the biological effect of ionizing radiation on human tissue?

Accepted Answer

It damages rapidly dividing cells, such as those in bone marrow, skin, and reproductive organs.

Question 15

Which of the following is the correct relationship between the units of radiation measurement: curie (Ci), becquerel (Bq), rad, gray (Gy), rem, and sievert (Sv)?

Accepted Answer

1 Ci = $$3.7 	imes 10$$^{10}$$ Bq; 1 Gy = 100 rad; 1 Sv = 100 rem

Question 16

Which of the following best explains why a Geiger counter is useful in a nuclear laboratory?

Accepted Answer

It detects beta and gamma radiation by measuring the ions produced, creating an electrical current.

Question 17

Which of the following is a correct statement about the use of radioisotopes in PET scans?

Accepted Answer

PET scans use positron emitters with short half-lives, such as $$^{18}\mathrm{F}$$, to study organ function.

Question 18

Which of the following best describes a nuclear chain reaction?

Accepted Answer

Each fission event releases neutrons that cause further fission events, rapidly increasing the number of reactions.

Chapter 5: Nuclear Chemistry – Structured Study Notes for GOB Chemistry

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