RAD 205 Ch. 5 Review

What is the purpose of personnel radiation monitoring?

• Reduce patient dose

• Detect contamination

• Ensure occupational exposure remains within limits

• Check equipment calibration

Answer explanation

The primary purpose of personnel radiation monitoring is to ensure that occupational exposure to radiation remains within established safety limits, protecting workers from harmful effects.

When must personnel monitoring be provided?

• When workers are likely to receive 10% of the annual dose limit

• Only for radiologists

• Only in nuclear medicine

• At the request of the employee

Answer explanation

Personnel monitoring is required when workers are likely to receive 10% of the annual dose limit to ensure their safety and compliance with radiation protection standards.

Which dosimeter is most sensitive to low doses?

• Film badge

• Pocket ionization chamber

• Thermoluminescent dosimeter (TLD)

• Optically stimulated luminescence (OSL)

Answer explanation

The Optically Stimulated Luminescence (OSL) dosimeter is the most sensitive to low doses of radiation, making it ideal for detecting small amounts of exposure compared to other dosimeters like film badges or TLDs.

What is the annual occupational effective dose limit for radiation workers?

• 50 mSv (millisieverts) per year.

• 10 mSv (millisieverts) per year.

• 100 mSv (millisieverts) per year.

• 5 mSv (millisieverts) per year.

Answer explanation

The annual occupational effective dose limit for radiation workers is set at 50 mSv per year, as established by regulatory bodies to ensure safety and minimize health risks associated with radiation exposure.

Which dosimeter uses aluminum oxide crystals?

• Film badge

• OSL

• TLD

• Pocket dosimeter

Answer explanation

The OSL (Optically Stimulated Luminescence) dosimeter uses aluminum oxide crystals to measure radiation exposure. In contrast, TLD (Thermoluminescent Dosimeter) uses lithium fluoride, while film badges and pocket dosimeters use different materials.

TLDs use what type of material to store radiation energy?

• Lithium fluoride

• Sodium iodide

• Aluminum oxide

• Cesium iodide

Answer explanation

TLDs, or thermoluminescent dosimeters, use lithium fluoride to store radiation energy. This material effectively traps energy from radiation, which can later be released as light when heated, allowing for accurate dose measurement.

Which dosimeter provides immediate readings?

• Film badge

• OSL

• Direct Ion Storage

• TLD

Answer explanation

The Direct Ion Storage dosimeter provides immediate readings by directly measuring ionization, unlike Film badges, OSL, and TLDs, which require processing for results.

Which of the following is NOT a feature of an OSL dosimeter?

• Long-term stability

• Reusability

• Can be reanalyzed

• Immediate readings

Answer explanation

An OSL dosimeter does not provide immediate readings; it requires processing to analyze the stored data. In contrast, it features long-term stability, reusability, and the ability to be reanalyzed.

True or False: TLDs are more sensitive to moisture than film badges.

• True

• False

Answer explanation

False is correct because TLDs (Thermoluminescent Dosimeters) are generally less sensitive to moisture compared to film badges, which can be affected by humidity and require careful storage to maintain accuracy.

Where should a dosimeter be worn if no lead apron is used?

• At the waist

• At the collar

• On the foot

• On the back

Answer explanation

A dosimeter should be worn at the collar to effectively measure radiation exposure to the head and neck area, which is critical when no lead apron is used for protection.