Occupational Health And Safety - Lab Animals

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Class A fire

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"Class A fire" means a fire involving ordinary combustible materials such as paper, wood, cloth, and some rubber and plastic materials.

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Class B fire

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"Class B fire" means a fire involving flammable or combustible liquids, flammable gases, greases and similar materials, and some rubber and plastic materials.

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Class C fire

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"Class C fire" means a fire involving energized electrical equipment where safety to the employee requires the use of electrically nonconductive extinguishing media.

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Class D fire

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"Class D fire" means a fire involving combustible metals such as magnesium, titanium, zirconium, sodium, lithium and potassium.

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Dry chemical extinquisher

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"Dry chemical" means an extinguishing agent composed of very small particles of chemicals such as, but not limited to, sodium bicarbonate, potassium bicarbonate, urea-based potassium bicarbonate, potassium chloride, or monoammonium phosphate supplemented by special treatment to provide resistance to packing and moisture absorption (caking) as well as to provide proper flow capabilities. Dry chemical does not include dry powders.

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"Multipurpose dry chemical"

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"Multipurpose dry chemical" means a dry chemical which is approved for use on Class A, Class B and Class C fires.

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Define "Rad"

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Rad means a measure of the dose of any ionizing radiation to body tissues in terms of the energy absorbed per unit of mass of the tissue. One rad is the dose corresponding to the absorption of 100 ergs per gram of tissue (1 millirad (mrad)=0.001 rad).

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Define "REM"

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Rem means a measure of the dose of any ionizing radiation to body tissue in terms of its estimated biological effect relative to a dose of 1 roentgen (r) of X-rays (1 millirem (mrem)=0.001 rem). The relation of the rem to other dose units depends upon the biological effect under consideration and upon the conditions for irradiation.

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Ionizing radiation - annual limit
total effective dose equivalent

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5 rems (0.05 Sv)

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Ionizing radiation - annual limit for:
deep-dose equivalent and the committed dose equivalent to any individual organ or tissue other than the lens of the eye being equal to

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50 rems (0.5 Sv)

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Annual Ionizing radiation limits to the lens of the eye

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lens dose equivalent of 15 rems (0.15 Sv)

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annual ionizing radiation limits to the to the skin and to the extremities

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A shallow-dose equivalent of 50 rems (0.50 Sv) to the skin or to any extremity

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Conversions
1 Gray (Gy) = ____rads

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100 rads

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Conversions
1 rem = ____ sievert (Sv)

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0.01 Sv

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Conversions:
1 Sv = ________ rems

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100 rems

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Conversions
1 rad = ______ Gy

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0.01Gy

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Units of measure (2) for ionizing radiation expressed as "dose equivalent"

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Rem
Sievert (Sv)

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SI units of measure (list 2) for ionizing radiation "absorbed dose"

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Gray (Gy)
Rad

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Meaning of "shallow-dose equivalent"

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The assigned shallow-dose equivalent must be the dose averaged over the contiguous 10 square centimeters of skin receiving the highest exposure.

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Measuring "deep dose equivalent"

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When the external exposure is determined by measurement with an external personal monitoring device, the deep-dose equivalent must be used in place of the effective dose equivalent, unless the effective dose equivalent is determined by a dosimetry method approved by the NRC.