Q: Which of the following best describes the relationship between the Gray (Gy) and the Sievert (Sv)?

$$1\ \text{Sv} is $$the absorbed dose in Gy multiplied by a quality factor (RBE)

Q: Which of the following units is NOT matched correctly with its property?

$$\text{Sievert (Sv)}$$ — Exposure

Q: Which of the following scenarios would result in the highest biological risk?

Absorbing $$1\ \text{Gy} of $$alpha particles (RBE = 20)

Q: Which of the following best describes the difference between the Curie (Ci) and the Becquerel (Bq)?

The Curie and Becquerel both measure activity, but $$1\ \text{Ci} = 3.7 \times 10$$^{10}$$\ \text{Bq}$$

Question 1

Which of the following units is used to measure the biological effect of absorbed radiation dose on human tissue?

Accepted Answer

$$	ext{Rem}$$

Question 2

A patient receives an absorbed dose of $$0.05\ 	ext{Gy} of X-$$rays. What is the equivalent dose in rem? 
ewline (Note: $$1\ 	ext{Gy} = 100\ 	ext{rad}$$, $$1\ 	ext{rad} = 1\ 	ext{rem}$$ for X-rays.)

Accepted Answer

$$5\ 	ext{rem}$$

Question 3

Which property is measured in units of $$	ext{Becquerel (Bq)}$$?

Accepted Answer

Activity (disintegrations per second)

Question 4

A laboratory technician is exposed to $$5\ 	ext{mCi} of $$radiation, while another is exposed to $$0.07\ 	ext{rad}. $$Which technician received more radiation, assuming both exposures are to the same isotope? (Note: $$1\ 	ext{Ci} = 3.7 	imes 10$$^{10}$$\ 	ext{Bq}$$, $$1\ 	ext{rad} = 0.01\ 	ext{Gy})$$

Accepted Answer

Cannot be determined without knowing the isotope and exposure time

Question 5

Which of the following best describes the relationship between the Gray (Gy) and the Sievert (Sv)?

Accepted Answer

$$1\ 	ext{Sv} is $$the absorbed dose in Gy multiplied by a quality factor (RBE)

Question 6

A solution of iodine-131 has an activity of $$0.08 	imes 10^9$\ 	ext{Bq/mL}. If$$ $$7.57\ 	ext{mL} is $$injected into a patient, what is the total activity administered in $$\mu	ext{Ci}$$? 
ewline (Note: $$1\ 	ext{Ci} = 3.7 	imes 10$$^{10}$$\ 	ext{Bq}$$, $$1\ \mu	ext{Ci} = 3.7 	imes 10^4$\ 	ext{Bq})$$

Accepted Answer

$$163.8\ \mu	ext{Ci}$$

Question 7

Which of the following statements about the Roentgen (R) is correct?

Accepted Answer

It measures the exposure of air to ionizing radiation

Question 8

If a person is exposed to $$2.5\ 	ext{Sv} of $$radiation, what is the equivalent dose in rem? 
ewline (Note: $$1\ 	ext{Sv} = 100\ 	ext{rem})$$

Accepted Answer

$$250\ 	ext{rem}$$

Question 9

Which of the following best explains why the Sievert (Sv) is a more useful unit than the Gray (Gy) for assessing health risks from radiation?

Accepted Answer

The Sievert accounts for the type of radiation and its biological effect

Question 10

A typical chest X-ray exposes a patient to an effective dose of $$0.02\ 	ext{mSv}. $$How many rem is this? 
ewline (Note: $$1\ 	ext{Sv} = 100\ 	ext{rem})$$

Accepted Answer

$$0.002\ 	ext{rem}$$

Question 11

Which of the following is the correct definition of Relative Biological Effectiveness (RBE)?

Accepted Answer

The ratio of the absorbed dose of reference radiation to the absorbed dose of test radiation required to produce the same biological effect

Question 12

Which of the following units is NOT matched correctly with its property?

Accepted Answer

$$	ext{Sievert (Sv)}$$ — Exposure

Question 13

A nuclear accident exposes a group of workers to $$0.75\ 	ext{Gy} of $$neutron radiation (RBE = 10). What is the equivalent dose in Sieverts?

Accepted Answer

$$75\ 	ext{Sv}$$

Question 14

Which of the following scenarios would result in the highest biological risk?

Accepted Answer

Absorbing $$1\ 	ext{Gy} of $$alpha particles (RBE = 20)

Question 15

Which of the following best describes the difference between the Curie (Ci) and the Becquerel (Bq)?

Accepted Answer

The Curie and Becquerel both measure activity, but $$1\ 	ext{Ci} = 3.7 	imes 10$$^{10}$$\ 	ext{Bq}$$

Question 16

A radioactive sample emits $$2.22 	imes 10$$^{12}$$ disintegrations per minute. What is its activity in Curie (Ci)? 
ewline (Note: 1$$\ 	ext{Ci} = 3.7 	imes $$10^{10}$$\ 	ext{disintegrations per second}$$)

Accepted Answer

$$1\ 	ext{Ci}$$

Units of Radiation Measurement and Biological Effects

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