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corectec > Exercise 4 > Flashcards

Exercise 4 Flashcards

0
Q

What publication recommends limits of exposure to ionizing radiation?

A

NCRP #116

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1
Q

Why do film badge holders have filters inside?

A

To determine radiation energies

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2
Q

Which publication contains regulations for using X-rays up to 50MeV?

A

NCRP #102

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3
Q

A “radiation area” sign must be visible in areas where the exposure rate exceeds how much? For a high radiation area sign?

A

.05 mSv/hr (5mrem/hr) for radiation area and 100mrem/hr for high radiation

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4
Q

What is rem?

A

Radiation Equivalent Man

Expresses equivalent dose. It is absorbed dose times a weighting factor for the type of radiation

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5
Q

Personnel monitoring shall be preformed if there is a possibility of exceeding how many millisievert (rem) per year?

A

5.0 mSv (.25rem)

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6
Q

What is covered in NCRP 102?

A

Equipment design and use, personnel monitoring, and radiation survey procedures.

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7
Q

What is a roentgen?

A

A measurement of the ionization of air produced by x or gamma radiation.

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8
Q

Which of the following is required on mobile fluoroscopy units? Why?

A) VCR capabilities
B) Image intensification
C) T.V. Monitoring
D) Solid state circuitry

A

B) Image intensification

Brightens the tim age about 4,000 times which allows less radiation exposure to the patient

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9
Q

What causes characteristic radiation?

A

Absent electrons in an ionized atom

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10
Q

How many milliroentgen are in one roentgen?

A

1000

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11
Q

What are two general types of radiation detection devices?

A

Field survey (ionization chambers and GM counters) used to determine exposure rates and detection of radiation

Personnel monitoring (film badges and TLDs) measure dose (dosimetry).

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12
Q

What is the diagnostic xray energy range?

A

Between 25-140 keV

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13
Q

What unit of measurement is equal to 1 joule per kilogram?

A

Gray

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14
Q

What is used in a optically stimulated luminescence dosimeter to detect radiation?

A

Aluminum oxide

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15
Q

What government agency is responsible for governing the use of radiation? How?

A

Food and Drug Administration

Conducts inspections of institutions to determine if the radiographic equipment meets the standards set by the NCRP and NCR

16
Q

What type of radiation is alpha and beta? Why?

A

Particulate radiation because they have mass

17
Q

What is the density of a film badge compared to in order to determine the exposure of a worker?

A

Density standard

18
Q

What is the least expensive radiation monitoring device?

A

Film badges

19
Q

What is a cutie pie?

A

A radiation survey instrument designed to detect x, gamma, and beta radiation. Looks like a space gun and is commonly found in the bey clear medicine department.

20
Q

What is the cumulative effective dose limit for a 25 year old radiation worker?

A

250mSv (25 rem) NCRP 116 recommends that an individual’s rem bank cannot exceed her/his age

21
Q

What increases the probability of photoelectric absorption occurring?

A

Decrees in kVp and increase in the atomic number of the material

22
Q

How accurate are optically stimulated luminescence dosimeters? Thermoluminescent dosimeters? Film badges?

A

OSL dosimeter to 1mrem

TLD to 5mrem

Film badge to 10mrem

23
Q

What do radiation monitoring instruments depend on?

A

Ionization

24
Q

What types of radiation can be detected by a Gieger-Mueller counter?

A

Alpha, beta, and gamma radiation

25
Q

What is a becquerel equal to? A curie?

A

A becquerel is 1 disintegration per second

A curie is 37,000,000,000 disintegration super second

26
Q

How is radioactivity measured?

A

In disintegrations

27
Q

What personnel monitoring device is capable of providing an immediate reading?

A

A pocket dosimeter

28
Q

How many rads are in a gray?

A

1 gray = 100 rad

29
Q

Describe an alpha particle.

A

2 protons and 2 neutrons

30
Q

What refers to the amount of ionizing radiation energy transferred by any type of radiation to any target material?

A

RAD

corectec (5 decks)

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