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Cedo Definitions > Cedo Definitions > Flashcards

Cedo Definitions Flashcards

1
Q

What is Activity

A

A measure of the disintegration rate

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2
Q

What is specific activity

A

A measure of the activity per unit weight of a radiographic source usually measured in curi’s or bequral per gram

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3
Q

What is characteristics Intensity

A

A measure of the amount of energy passing through a given area in a given amount of time. Usually measured in milli sieverts per hour @ 1 meter or mill Rankin per hour @ 1 meter.

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4
Q

Radiation intensity

A

A measure of the amount of radiation energy absorbed by any matter in a radiation field

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5
Q

What is radiation absorbed dose

A

A measure of the energy deposited in a material as the radiation passes through that material

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6
Q

What is relative biological effectiveness

A

A measure of the relative harmfullness of the types of radiation

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7
Q

What is roentgen Equivalent man (dose equivalent)

A

Equates to the biological damage from various forms of radiation

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8
Q

What is half life

A

The time it taken by a particular isotope for the activity to decay to one half the original level

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9
Q

What is absorbed dose

A

The radiation that has been absorbed by some substance usually human tissue

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10
Q

Alarming dosimeter

A

A small electronic instrument that a person wears on the the trunk of the body. It will sound an alarm when a high radiation dose rate is encountered usually at 5 mill sieverts per hour or when the total dose reaches 2 milli sieverts. Must be calibrated with in a 12 month period.

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11
Q

What is an atom

A

The smallest unit of an element consisting of a nucleus made of protons and neutrons, with orbiting electrons

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12
Q

What is attenuation

A

The reduction in intensity of radiation as it passes through any material

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13
Q

Battery check

A

A function of the Survey meter used to verify the condition of the batteries

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14
Q

What is a Becquerel

A

Si unit of activity equal to one disintegration per second

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15
Q

What is calibration

A

The act of checking by comparing to a known standard the accuracy of a measuring instrument.

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16
Q

What is the Canadian nuclear safety commission

A

Federal agency responsible for regulating the development, application and use of nuclear energy in canada

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17
Q

What is a certified exposure device operator

A

A person who has the qualifications to safely operate industrial radiography exposure devices in canada and is certified by the cnsc to do so

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18
Q

What is cobalt 60

A

An Industrial isotope used in radiography with a half life of 5.3 years.

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19
Q

What is a collimator

A

A radiation shield found at the end of the source guide tube. Usually made of tungsten depleted uranium or lead

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20
Q

What is contamination

A

The spread of radioactive material when the source capsule leaks

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21
Q

What is decay (radioactive decay)

A

The process by which an unstable atom loses energy by emitting ionizing radiation

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22
Q

What is Delayed effects

A

Those effects caused by radiation that do not become evident until years or generations after the exposure.

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23
Q

Depleted uranium

A

Often used as a shielding material. It contains less of the isotope u 235 than in natural uranium.

24
Q

What is a direct reading dosimeter

A

A small air filled ionization chamber used to measure radiation dose. Often referred to as a pocket dosimeter.

25
Q

What is disintegration

A

Refers to decay

26
Q

What is dose (radiation absorbed dose)

A

Quantity measure of the amount of radiation imparted to matter per unit mass.

27
Q

What is dose rate

A

Also referred to as radiation intensity. It is a measure of radiation dose per unit time. The si system are sieverts per hour or roentgen per hour

28
Q

What is a dosimeter

A

A device used to measure personal radiation dose.

29
Q

What is electromagnetic radiation

A

Radiation energy that has no rest mass. It’s pure energy and travels at the speed of light. Two examples are x-rays and gamma rays

30
Q

What are electrons

A

A subatomic particle with a negative charge that orbit the nucleus

31
Q

What is an element

A

A pure chemical substance of which the smallest unit is an atom

32
Q

What is exposure

A

Being exposed to radiation

33
Q

What is gamma radiation

A

High energy photons of energy emitted from the nucleus of an unstable atom

34
Q

What is gamma radiography

A

The process of using radioactive materials that emit gamma radiation for the purpose of industrial radiography

35
Q

What is half value lay

A

The thickness of a material required to reduce penetrating radiation to one half

36
Q

What is half life

A

The time taken by a specific isotope for the activity to decay to one half the original level

37
Q

What is industrial radiography

A

The use of penetrating radiation to inspect material for flaws.

38
Q

What is a ion

A

An atom or molecule in which the total number of electrons is not equal to the to the number of protons resulting in a positive or negative charge

39
Q

What is ionization

A

The process of adding or removing electrons. from atoms or molecules thereby creating ions

40
Q

Ionizing radiation

A

Radiation capable of displacing electrons from atoms, thereby producing ions

41
Q

What is iridium 192

A

A isotope used in gamma radiography. It has a half life of 74 days

42
Q

What is a isotope

A

A nuclide of an element having the same number of protons but a different number of neutrons

43
Q

What is a leak test

A

A test used to determine radioactive material has been released from the source capsule

44
Q

What is lethal dose

A

The dose of radiation expected to cause death to those exposed. In the average human this represents approximately 5 sievert whole body dose

45
Q

What is a licensee

A

A person who is licensed to possess, transfer, import, use or abandon a nuclear substance. License are granted by cnsc

46
Q

What is a molecule

A

The smallest element of a chemical compound still having the chemical properties of that compound

47
Q

What is non ionizing radiation

A

Radiation that does not carry enough energy to ionize atoms or molecules. Ie radio waves, microwaves, infrared radiation

48
Q

What is a Placard

A

The sign on a vehicle that indicates the vehicle is carrying radioactive material.

49
Q

What is a pocket dosimeter

A

Refered to as a direct reading dosimeter

50
Q

What are prompt effects

A

The health effects resulting from radiation exposure appearing within a day or few weeks

51
Q

What is the radiation dose limits

A

Legal limits of the radiation dose that a person may receive as established by regulations. Max allowed is 50 milli sieverts per year or 1 milli sievert per week on a 50 week schedule with two weeks of vacation

52
Q

Define Radiation safety officer

A

A person appointed within an organization to ensure all cnsc requirements are followed.

53
Q

What is radiation survey

A

A measurement of radiation taken using a radiation survey meter

54
Q

What is radioactivity

A

The process of spontaneous transformation of the nucleus of an isotope emitting alpha or beta particles often accompanied by gamma rays

55
Q

What is a radiograph

A

A photographic record produced by passage of x-rays or gamma rays through an object on to a film

56
Q

What is a radio isotope

A

An isotope of an element that have an unstable nucleus

Cedo Definitions (1 decks)

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