Introduction To Si Units Worksheet Page 2

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pico (p) = 10 x 10-12
Now that you understand metric prefixes, let’s review common units of measure and learn their SI
equivalents.
Radiological Units
Curie (Ci) - The curie (Ci) describes the quantity or activity of radioactive materials. It is equal to
37 billion disintegrations per second (dps).
Its SI equivalent, the becquerel (Bq), is equal to only 1 dps.
Therefore:
o 1 Bq = 27 pCi
o 1 Ci = 37 GBq
Rad - The amount of energy deposited in any material is measured in rads. The rad is the unit of
absorbed dose. 1 rad = 100 ergs/gram.
Its SI equivalent, the gray (Gy), is equal to 1 joule/kilogram.
Therefore:
o 1.) Gy = 100 rad
Rem - The rem (roentgen equivalent man) is used to measure the dose equivalent to human
tissue.
Its SI equivalent is the sievert (Sv).
o 2.) 1 Sv = 100 rem
Other Common Units
Many SI units are used in dose projections and accident assessments. The list below contains those most
commonly used in this course.
Length - The meter (m) is the SI unit of length. Common units of measure are equal to the
following:
o 1 inch (in) = 2.540 centimeters (cm)
o 1 foot (ft) = 12 in = 30.48 cm (or 0.3048 m)
o 1 yard (yd) = 0.9144 m • 1 mile (mi) = 5280 ft = 1.609 kilometers (km)
o 1 km = 1000 m = 0.6214 mi
To quickly convert between miles (mi) and kilometers (km), use the following:
o ___ mi x 1.61 = ___ km
o ___ km ÷ 1.61 = ___ mi
Velocity - The SI unit of velocity is meters/second (m/sec). Common units of measure are equal
to the following:
1 mile per hour (mph) = 0.4469 m/sec (or 1.467 ft/sec = 1.609 km/h)
o

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