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Ch 15 Radiation Safety (for RDA Exam) Questions and Answers
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Dental x-rays - Answer-Any exposure to radiation no matter how small has the potential to cause a biological changes Types of radiation: primary - Answer-The x-rays that come from the target of the x-ray tube Types of radiation: secondary - Answer-Radiation that is created when the primary in...

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  • October 10, 2024
  • 5
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • ch 15 radiation safety for rda exam questions an
  • dental x rays answer any exposure to radiation n

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Ch 15 Radiation Safety (for RDA Exam)
Questions and Answers
Dental x-rays - Answer-Any exposure to radiation no matter how small has the potential
to cause a biological changes

Types of radiation: primary - Answer-The x-rays that come from the target of the x-ray
tube

Types of radiation: secondary - Answer-Radiation that is created when the primary
interacts with matter
(Teeth, soft and hard tissues of the head)

Types of radiation: scatter - Answer-A form of secondary radiation

Results when the x-ray beam has been deflected from its path by the interaction with
matter and travels in all directions

rad - Answer-amount of radiation absorbed by tissue

rem - Answer-To compare the biological effects of different types of radiation

mrem - Answer-Small measurement of radiation

Maximum Permissible Dose (MPD) - Answer-Whole body radiation For those who are
occupationally exposed to radiation is 5.0 rem per year (10,000 dental x-rays)

Non-occupationally exposed persons - Answer-Current MPD is 0.5 rem per year (1000
dental x-rays)

Dental assistant should strive for a dose of.... - Answer-0 rem by following the radiation
precaution practices

0.1 mrem = - Answer-Digital x-rays are 80% less than conventional older x-rays

ALARA concept - Answer-States that all exposure to radiation must be kept to a
minimum

"As low as reasonably achievable"

latent period - Answer-The years after the time the x-ray was absorbed

The effects of radiation may not become evident for many years

, Exposure to radiation has a.... - Answer-Cumulative affect overtime

When tissues are exposed to x-rays some damage occurs but.... - Answer-Tissues have
the ability to repair some of the damage

acute radiation exposure - Answer-When a large dose of radiation is absorbed in a short
period such as in a nuclear accident

Chronic radiation exposure - Answer-When small amounts of radiation are absorbed
repeatedly over a long period.

The effects of chronic exposure may not be observed until years after the originial
exposure.

Higher sensitivity to radiation - Answer-Reproductive cells
skin

Medium radiation sensitivity - Answer-Connective tissue
thyroid gland
kidney

Low sensitivity to radiation - Answer-Muscles
nerves

Genetic cells - Answer-reproductive cells

Somatic cells - Answer-All other cell except reproductive

genetic mutations - Answer-Changes in the genetic material of cells that passes from
one generation to another.

Damage of cells is passed on to generations

If somatic cells are damaged.... - Answer-They will not be passed down to future
generations

Lead apron - Answer-Protects the reproductive and blood forming tissues from 98% of
scatter radiation

Thyroid collar - Answer-Reduce his exposure by 50%

Even though the radiation dose to reproductive cells is small it is advisable to postpone
- Answer-Non-emergency radiographs until after pregnancy

In case of an emergency a minimal number of x-rays can be taking on someone that is
pregnant

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