NMCTB : Radiation Safety and Regulations Practice Questions

If the half value layer for some radionuclide in lead is 0.30 mm, what thickness of lead shielding is necessary to reduce the radiation exposure from 8 mR/hr to 1 mR/hr?

0.9 mm

Which instrument is best used for a removable contamination survey?

Well Counter

All of the following are required by the NRC when handling radioactive materials EXCEPT?

Laminar Flow Hood

Which of the following individuals is NOT listed on the radioactive materials license?

Supervised User

Which of the following is NOT required by the NRC to be posted?

NRC Form 5

The October radiation dosimetry report of a 21 year old technologist is shown below. Which of the following readings exceeds the NRC ALARA philosophy?

Monthly = 30 mrem

Quarterly = 175 mrem

Year To Date = 400 mrem

Permanent = 1,100 mrem

Quarterly

According to nationally recognized standards, how often should a linearity test be performed on a dose calibrator?

Quarterly

Due to a manufacturer mislabeling, a patient received 5 mCi of Tc99m pertechnetate intravenously instead of the prescribed 2 mCi. The resulting image is technically satisfactory. According to the Nuclear Regulatory Commission regulations, this is a(n):

Error

If you are standing next to a patient who is emitting 210 mR/hr, how long can you receive this amount of exposure before you receive 4 mREM?

1.1 minutes

What is the maximum amount of radiation that a radiation worker can be exposed to in one year?

5,000 mREMs

An occupationally exposed radiation worker has declared pregnancy. What is the maximum allowable radiation dose to the fetus?

500 mREM for the remainder of the pregnancy

A department is undergoing an unannounced NRC inspection. Which of the following questions guide the inspector?

What is the risk level and consequences?

What is the correct label for a radioactive package with a surface reading of 1.8 mR/hr and a TI of 0.3 mR/hr?

Yellow II

Which device is most appropriate for a radiation worker receiving a planned radiation exposure of significance?

Pocket Ionization Chamber

Radiation workers are responsible for protecting the public from open sources of radiation. What is the limit of radiation exposure to the public?

2 mREM in any hour

At what level of acute radiation exposure do you see acute radiation sickness?

200 REM

What is the correct sign to be posted in an area where radioactive materials are stored and used?

Caution : Radioactive Materials

What is the quantity of radioactive material can you have without a radioactive mateirals license?

Exempt Quantity

What is the record retention period for ambient dose rate surveys and removable contamination surveys?

3 years

An employee wishes to get a copy of their exposure record from an employer where they worked 15 years ago. Will they be able to obtain that record?

Yes, the record should be retained until license termination

What type of material is the most appropriate for shielding a pure beta negative emitter?

Plastic

What is the first step when a major radiation spill occurs?

Clear the area

What is the correct way to dispose of a Co-57 sheet source?

Return to manufacturer

Which of the following will have the highest linear energy transfer?

Alpha Particles

Which NRC regulations address "Protection Against Radiation"?

10 CFR 20

Which of the following is NOT regulated by the NRC?

Medial Linear Accelerators