RSO Dosimetry and Personal Exposure Assessment 2

Question 1

The shallow dose equivalent (SDE) on a personnel dosimeter measures dose at a tissue depth of:

Accepted Answer

0.007 cm (70 µm)

Answer

0.3 cm

Answer

1.0 cm

Answer

10.0 cm

Question 2

A personnel dosimeter reading must be investigated when it exceeds what percentage of the applicable dose limit according to NRC guidance?

Accepted Answer

25%

Answer

10%

Answer

50%

Answer

75%

Question 3

To estimate effective dose when using two dosimeters (collar outside apron, waist under apron) during fluoroscopy, the NCRP formula uses:

Accepted Answer

0.025 × collar + 0.5 × waist (or similar weighting formula)

Answer

Average of the two readings

Answer

0.5 × collar + 0.5 × waist

Answer

Maximum of the two readings only

Question 4

A radiation worker's finger ring dosimeter shows 1,500 mrem for the month. The NRC quarterly limit for extremity dose is:

Accepted Answer

12,500 mrem (part of 50 rem/year extremity limit)

Answer

1,250 mrem

Answer

3,750 mrem (part of 50,000 mrem/year)

Answer

5,000 mrem

Question 5

Internal dose assessment via bioassay is required when a worker's intake of radioactive material could result in a committed effective dose exceeding:

Accepted Answer

10 mSv (1 rem)

Answer

0.1 mSv (10 mrem)

Answer

1 mSv (100 mrem)

Answer

5 mSv (500 mrem)

Question 6

Which type of dosimeter provides real-time dose-rate information that passive dosimeters cannot?

Accepted Answer

Electronic personal dosimeter (EPD)

Answer

Film badge

Answer

TLD

Answer

OSL dosimeter