Chapter 5: Radiation monitoring

In keeping with the ALARA concept, most health care facilities issue dosimetry devices wen personnel could receive approximately BLANK of the annual occupational EfD limit in any month, or approximately 0.5 mSv (50 mrem)

1%

What different filters are incorporated into the detector packet of the OSL dosimeter?

1. Aluminum

2. Tin

3. Copper

1, 2, and 3

Diagnostic imaging personnel should wear a personnel dosimeter during routine operations in an imaging facility because the device provides

1. An indication of an individual’s working habits

2. An indication of working conditions in the facility

3. A way for the employer to determine whether radiation workers are actively engaged in performing a specific amount of X-ray procedures during a given period

1 and 2 only

After processing, if the average OSL control monitor reading is greater than zero, it indicates

The the associated group dosimeters may have been exposed to radiation in transit

Which of the following imaging professionals most commonly wear TLD ring dosimeters?

Nuclear medicine technologists

Which of the following instruments should be used in a laboratory setting to detect alpha beta radiation and small amount go other types of low-level radioactive contamination?

Proportional counter

Which of the following devices is used to measure the amount of ionizing radiation to which a TLD ring dosimeter has been exposed by first heating the crystals to free the trapped, highly energized electrons and then recording the amount of light emitted by the crystals (which is proportional to the TLD ring dosimeter exposure)?

TLD analyzer

In a health care facility, a radiographer’s deep, eye, and shallow occupational exposures, as measured by an exposure monitor, may be found on the

Personnel monitoring report

Each filter in an OSL dosimeter blocks a portion of the radiation-sensitive aluminum oxide and causes a different degree of attenuation for any radiation striking the dosimeter, depending on its

Energy

Which of the following personnel monitoring devices resembles a flash drive in appearance?

Personal DIS dosimeter

Radiation survey instruments measure which of the following?

1. The total quantity of electrical charge resulting from ionization of gas

2. The rate at which an electrical charge is produced

3. Luminescence

1 and 2 only

What do ionization chamber-typer-survey meters, proportional counters, and GM meters have in common?

Each contains a gas-filled chamber

Which of the following radiation monitors is currently the most commonly used dosimeter for monitoring whole body occupational exposure in diagnostic imaging and radiation therapy?

OSL

Which of the following are disadvantages of the TLD ring dosimeter

1. Thermoluminescence readings will be lost of not carefully recorded

2. Calibrated dosimeters must be prepared before-hand and read with each group of TLD dosimeters as they are processed

3. The readout process destroys information stored in the TLD, thus preventing the “read” TLD from serving as a permanent legal record of exposure

4. LiF is used as the sensing material in the TLD

1, 2 and 3 only

The DIS dosimeter is readout through a

Physical device such as a universal series bus (USB) or via wireless connection and the data stored electronically at the facility

The OSL dosimeter uses

An Al2O3 thin layer detector

The ionization chamber-type-survey meter measures x-radiation and gamma radiation, and, if equipped with a suitable window, can also record

Beta radiation

Monitoring companies send a control monitor to health care facilities along with each batch of dosimeters. The control monitor should be

Kept in a radiation-free area within the imaging facility

Dosimeter readings that exceed a trigger level set by the health care facility are investigated to

Ascertain the cause of the reading

The TLD readout process

Destroys the information stored in the TLD

An ionization chamber-type-survey meter is also referred to as a

Cutie pie

The increase sensitivity of the OSL dosimeter makes it ideal for monitoring employees working in low-radiation environments and for

Monitoring of pregnant workers

The RSO in a health care facility receives and reviews personnel monitoring reports to

Assess compliance with ALARA guidelines

Wearing a personnel dosimeter in a consistent location is the responsibility of the

Individual wearing the device

On termination of employment, a radiographer must receive a copy of

His or her occupational exposure report