Radiation Safety Training
ISU Technical Safety
Office, Campus Box 8106
Pocatello, ID 83209
How to use this training
Contact TSO with questions
Radiation Safety Trng in .doc
Radiation Safety Trng in .pdf
Radiographic Sci Trng in .doc
Radiographic Sci Trng in .pdf
planning of work, good handling techniques and thorough monitoring are all
necessary to minimize external exposure. Adequate shielding and distance
from sources are also important factors in reducing exposure.
Workers can apply three principles to protect themselves
from ionizing radiation exposure:
the less time a person spends in a radioation field, the less exposure
he/she will receive. Keep in mind that exposures to radiation
are additive in their effect.
minimize time of exposure to a radiation field
- Preplan the task thoroughly prior to
entering the area. Use only the number
of people required for the job.
- Have all the
necessary tools prior to entering the area.
efficiently but swiftly.
- Do the job
right the first time.
- Perform as
much work outside the area as possible.
The greater the distance you are from a source the smaller
the exposure. Staying away from a
radiation source, even a few feet, will greatly reduce worker exposure.
The radiation dose rate from point sources can be calculated using the following
Dose rate = Γ A/ (d2)
- Γ is a constant that depends on the
- A is the activity in (Ci)
- d is the distance from the source in (m)
From the above formula for two
distances d1 and d2 results that:
exposure rate at distance d1
exposure rate at distance d2
- Be familiar with radiological conditions in the area.
- During work delays, move to lower dose rate areas.
Shielding places protective materials between the worker and
the source; for example, walls, barriers, or protective clothing.
Proper uses of shielding
- Take advantage
of permanent shielding.
temporary shielding as necessary.
are monitored by using individual monitoring devices. These devices are required to be used if the
worker is likely to receive an external exposure that will exceed 10 percent of
your allowed annual dose. The most
commonly used monitoring devices are:
Dosimeter (TLD)-(modern technology often uses Optically Stimulated Luminescence (OSL) Dosimeters)
- Direct Reading
The whole body badge is worn to measure the exposure to the whole
body (i.e., between the neck and the waist).
Finger rings are worn on the work
hand and underneath a glove so as not to contaminate the ring.
The DRDs are
worn adjacent to the whole body badge.
Dosimetry devices issued from ISU's Radiation Safety Office
are used to monitor the exposure that you receive while performing work at ISU
only, and cannot be used at any other facility.
It is important that they are returned to their proper storage location
when they are not in use. This ensures
that the badges are only recording your exposure from work performed at ISU,
and also minimizes the chance of the badges being misplaced or lost.
If you are personally receiving radiation exposure for
diagnostic or therapeutic purposes, DO
NOT wear your dosimeter. Contact the RSO to discuss this situation. Be
certain to contact RSO/TSO if you are exposed to radiation at other
The dosimeters will be picked up and replaced every three
months for processing. Personnel that
fail to return dosimeters, or return them to their proper storage locations,
will be restricted from continued radiological work at ISU.
Temporary dosimeters will be issued on a case by case basis
only. The professor in charge of the lab
or facility will be responsible for the radiological actions of the potentially
exposed individual. Temporary badges will not be issued as a vehicle to
circumvent training requirements.
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