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Radiation Safety Training Module
Radiographic Sciences and Analytical X-ray Machines
Study Guide
ISU Technical Safety Office, Campus Box 8106
Pocatello, ID 83209
(208) 282-2311/2310

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Acronym List


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Radiation Safety Trng in .doc

Radiation Safety Trng in .pdf

Radiographic Sci Trng in .doc

Radiographic Sci Trng in .pdf


Quantities and Units

Dose and dose rate
a.   dose is the amount of energy per unit of mass
b.   dose rate is the dose divided by the time in which the dose is received

Roentgen (R)

1)    Is the unit of exposure to ionizing radiation and applies only to gamma and x -rays.
 2)   Corresponds to the generation of approximately 2.58×10-4 C/kg in dry air at standard
        temperature and pressure (STP).

           3)   1R = 1,000 milliroengten (mR)

Rad (unit of absorbed dose)
            1)    Is the amount of energy from any type of radiation deposited in the unit mass of any material.
            2)    Measures absorbed dose on different types of material but does not take into account the effect
                    that different types of radiation have on the body

Rem (unit of dose equivalent)
            1)    Takes into account the energy absorbed in tissue as well as the biological effect on the body
                     that different types of radiation have (dose equivalent)

            2)    1 rem = 1000 millirem (mrem)
These are the SI unit equivalents to rad and rem
            1 Gy= 100 rad
            1 Sv = 100 rem

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