IRRSP Source Management and Security 3

Question 1

What is the half-life of Iridium-192 (Ir-192), the most commonly used industrial radiography isotope?

Accepted Answer

73.83 days

Answer

30.2 years

Answer

5.27 years

Answer

8.02 days

Question 2

Which isotope used in industrial radiography has the longest half-life among those listed below?

Accepted Answer

Cobalt-60 (Co-60) — 5.27 years

Answer

Iridium-192 (Ir-192) — 73.83 days

Answer

Selenium-75 (Se-75) — 119.78 days

Answer

Thulium-170 (Tm-170) — 128.6 days

Question 3

What is the required method for disposing of a depleted or unwanted sealed source used in industrial radiography?

Accepted Answer

Transfer it to a licensed recipient, waste broker, or return it to the manufacturer

Answer

Bury it on-site after confirming dose rate is below background

Answer

Dispose of it in a municipal landfill after surveying with a calibrated instrument

Answer

Submerge it in a designated water-filled shielding tank indefinitely

Question 4

What information must be recorded and reported to the NRC when a licensee transfers a sealed source to another party?

Accepted Answer

The source identity, estimated activity, transfer date, and recipient's license number

Answer

Only the recipient's name and mailing address

Answer

Only the source serial number and activity level

Answer

No reporting is required for routine source transfers between licensed parties

Question 5

During a source change on an exposure device, what is the primary radiological concern for the radiographer performing the procedure?

Accepted Answer

Occupational dose exposure during the source exchange procedure

Answer

The new source may arrive with surface contamination from the manufacturer

Answer

The old source may cross-contaminate the new source during transfer

Answer

The guide tube may become permanently radioactively activated

Question 6

Under 10 CFR 37, what access control measure is required for locations where Category 1 or 2 quantities of radioactive material are stored?

Accepted Answer

Access must be limited to individuals with unescorted access authorization

Answer

A radiation survey must be posted outside the storage area

Answer

A minimum of two armed security officers must guard the storage area at all times

Answer

Storage areas must be located at least 500 feet from any occupied building

Question 7

What written plan is required under 10 CFR 37 for licensees possessing Category 1 or 2 quantities of radioactive material?

Accepted Answer

A physical protection plan addressing security measures and access control

Answer

An emergency response plan filed with local fire departments

Answer

A transportation security plan reviewed by the Department of Homeland Security

Answer

A radiation monitoring plan approved by state health authorities