Monitoring of Personnel & Radiation Survey Instruments

Advantage to an optically stimulated luminescence dosimeter is the dose measurement range very wide, ____ mrem to _______ mrem.

1, 1000

Monitoring is mandatory when personnel are likely to receive __________ of the annual effective dose-equivalent limit.

1/10th

A disadvantage to a film badge is that it has a low limit of sensitivity (approx ______ mrem).

10

Film used for film badges is similar to dental x-ray film and measures doses as low as ____ mrem.

10

A disadvantage to a film badge is that is has an accuracy limited to +/- _____-_____%

10-20

Advantage to an optically stimulated luminescence dosimeter is the accuracy for shallow and deep exposures is +/- ___%.

15

Pocket dosimeters are sensitive to exposures up to ______ mR.

200

Advantage of thermoluminescent dosimeters is that they can be worn for up to ____ months.

3

Advantage of thermoluminescent dosimeters are that is has an accuracy to approximately +/- ____%.

5

Advantage of thermoluminescent dosimeters are their low exposure limit which is ____ mrem.

5

_____ rem is the annual effective dose (occupational exposure).

5

Optically stimulated luminescence dosimeters contain filters composed of aluminum, tin and copper asa well as a thin strip of ____________ ________ which is stimulated by a ________.

Aluminum oxide, laser

Filters made of _____________ and ___________ measure intensity and type (aka: quality) of radiation striking the film badge.

Aluminum, copper

If exposure exceeds this predetermined range for a pocket dosimeter, any additional amounts of exposure __________ be documented.

Cannot

Shallow and _______ doses can be calculated according to the amount of darkening of the film after processing.

Deep

The measurement of ionizing radiation doses to personnel is termed:

Dosimerty

Pocket dosimeters are normally used in:

Emergency situations

3 types of dosimetry:

Film badges, thermoluminescent dosimeters (TLD), optically stimulated luminescence (OSL or OSLD)

Thermoluminescent dosimeters are commonly worn as _________ _________ by nuclear medicine & IR personnel.

Finger rings

Used to detect alpha & beta radiation, gas-filled tube, displayed as a needle movement, lamp or audible clicks.

Geiger-Mueller Detector

3 field survey instruments used to detect and measure radiation:

Geiger-Mueller Instruments, Scintillation Detection Devices, Ionization Chamber Instruments

Pocket dosimeters provide an _____________ readout and must be _______________ daily.

Immediate, recalibrated

Film badges are (expensive/inexpensive).

Inexpensive

What causes hair fiber to move in a pocket dosimeter?

Ionization

In an ___________ ____________ instrument, the intensity of the signal is proportional to the radiation exposure that occurred in the air volume of the chamber.

Ionization chamber

Used to detect x-ray, gamma, alpha and beta radiation; compact and lightweight, ionization chamber.

Ionization chamber-type survey meter (cutie pie)

Thermoluminescent dosimeters (TLD) contain what type of crystals?

Lithium fluoride or calcium fluoride

Film badges are typically developed how often?

Monthly

Advantages to film badges are that they are simple to use and they provide a ____________ record.

Permanent

Disadvantage to a pocket dosimeter is that it does not provide a __________ legal record of exposure and _______________ it can cause false high readings.

Permanent, bumping

Advantage to an optically stimulated luminescence dosimeter is complete re-analysis available - can be ____________ many times.

Restimulated

Used in gamma cameras in nuclear medicine and in come CT scanner detectors.

Scintillation detection device

The amount of measured ________ ______ given off after being heated is proportional to the absorbed radiation dose.

Visible light

When heated, the crystals in a thermoluminescent dosimeter release energy as:

Visible light