Radiation doses of radiographic examinations

 

Examination

Effective dose (mSv)

Dose equivalence *) as PA images (number of)

Dose equivalence during exposure to background radiation

Limb, e.g. knee

0.01

0.3

1 day

Paranasal sinuses

0.03

1

3 days

Lung (PA view)

0.03

1

3 days

Lung (PA view and LAT view)

0.1

3

12 days

Cranial

0.1

3

12 days

Cervical spine

0.2

7

24 days

Mammography

0.3

10

36 days

Thoracic spine

1

30

4 months

Pelvis

1

30

4 months

Lumbar vertebrae

2

70

8 months

Abdomen (native)

2

70

8 months

Urinary tract (urography)

4

130

16 months

Colon

9.1

300

3 years

CT scans

Head

2

70

8 months

Pulmonary

9

300

3 years

Lumbar vertebrae

9

300

3 years

Abdomen

12

400

4 years

*) PA = posterioranterior views
According to STUK’s investigation, the data presented in the table is equal to the average radiation expo-sure of a person residing in Finland. The doses caused by both background radiation and X-ray examinations vary in different locations. Variation in excess of 30 per cent is not uncommon.

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