Airborne And Surface Contaminations Limits

Question 1

Purpose of airborne radioactivity limits

Answer 1

• Prevent the inhalation of airborne radioactivity from causing significant internal radiation dose
• Preclude the need to monitor non-radiation workers in uncontrolled spaces

Question 2

Airborne Radioactivity limits per NNPP

Answer 2

1x10^-9 uCi/ml for long lived particles

Question 3

What airborne radioactivity limit are full-face filtered respirator (Mark V) used?

Answer 3

Greater than or equal to 1x10^-9 uCi/ml but less than 1x10^-7.

Question 4

What airborne radioactivity limit are Forced Air supply (EAB, SCBA) used?

Answer 4

Greater than or equal to 1x10^-7 uCi/ml but less than 1x10^-6 uCi/ml

Question 5

What airborne radioactivity limit are is no no personnel entry (evacuate space) used?

Answer 5

Greater than 1x10^-6 uCi/ml

Question 6

If you enter an area where the airborne radioactive levels are greater than 1x10^-6 uCi/ml what is the proper respiratory protection?

Answer 6

No personnel entry (evacuate space).

Question 7

If you enter an area where the airborne radioactive levels are greater than or equal to 1x10^-7 uCi/ml but less than 1x10^-6 uMci/ml what is the proper respiratory protection?

Answer 7

Forced Air Supply (EAB,SCBA).

Question 8

What are some examples of forced air supply?

Answer 8

EAB, SCBA.

Question 9

If you enter an area where the airborne radioactive levels are greater than or equal to 1x10^-9 uCi/ml but less than 1x10^-7 uCi/ml what is the proper respiratory protection?

Answer 9

Full-face filtered respirator. (Mark V)

Question 10

What are the methods for controlling airborne exposure for NNPP?

Answer 10

*Engineering controls
*Adminstrative controls
*Personnel Protective Equipment (PPE)

Question 11

What are loose surface contaminations limits for Beta and Gamma Contamination per NNPP?

Answer 11

450 uuCi/100 cm^2

Question 12

What are fixed surface contaminations limits for Beta and Gamma Contamination per NNPP?

Answer 12

450 uuCi/100Cm^2

Question 13

What are loose surface limits for Alpha Contamination per NNPP?

Answer 13

MDA= 50uuCi/frisk
* Should be undetectable
* Monitoring not required unless the material is exposed to alpha contamination

Question 14

What are the limits of an Controlled Surface Contamination Area (CSCA)?

Answer 14

Greater than 450 uuCi/100cm^2 for Beta, Gamma
Greater than 50 uuCi/100cm^2 for alpha

Question 15

What is CSCA?

Answer 15

Controlled Surface Contamination Area

Question 16

What are precautions associated with CSCA?

Answer 16

*Control point area and watch for access.
*Boundaries and posting required.
*no eating, drinking, smoking, chewing, etc.
*Anti-contamination clothing (Anti-C’s) required

Question 17

What is a radiologically controlled area?

Answer 17

• CSCA (contamination surface control area)
• Area with one or more CSCAs.
• Area established to allow personnel to move between CSCAs or to areas of lower background radiation levels for frisking.
  *CPA and watch are required for access.

Question 18

What area is established to allow personnel to move between CSCAs or to areas of lower background radiation levels for frisking?

Answer 18

Radiologically Controlled Area

Question 19

What does CPA mean?

Answer 19

Control Point Area

Question 20

What is a Control point area (CPA)?

Answer 20

The area on the boundary of an RCA or CSCA is used to accomplish personnel and material monitoring to ensure contamination is not spread into uncontrolled areas.

Question 21

What must a CPA surface contamination level be measured at?

Answer 21

450 uuCi/100Cm^2

Question 22

If you drink a normal amount of contamination water, will you exceed whole body exposure limits in a year?

Answer 22

No.

Question 23

What are waterborne contamination limits for a non-nuclear ship?

Answer 23

1x10^-6 uCi/ml

Question 24

What are waterborne contamination limits for a nuclear-powered ship and IMAs?

Answer 24

5x10^-7uCi/ml

Question 25

At what distance is dosimetry required for divers from a reactor compartment?

Answer 25

Within 50 feet.

Question 26

What must divers be briefed on prior to operations for nuclear powered ships?

Answer 26

locations of the Reactor Compartment, sea chests for reactor systems, and radioactive waste discharges.

Question 27

Should diving operations occur when the reactor is on?

Answer 27

No, unless it is absolutely necessary.

Question 28

If a diver must conduct diving operations for a nuclear ship what can they not do?

Answer 28

Approach within 10 feet of any hull in the way of the Reactor Compartment (RC) until it has shut down for 15 minutes.

Question 29

A diver is conducting operations for a nuclear ship and the reactor is shut down. What are some considerations for the diver as it pertains to radiological control?

Answer 29

*Must observe a 10 min max stay time
*Must exit area after the above and return with a new stay time based on either TLD or EPD readings.

Question 30

What PPE should a diver have if they interact with radioactive liquid waste sea or sea chest?

Answer 30

Rubber gloves

Question 31

If a diver touched radioactive contamination or radioactive sea chest, what needs to be done?

Answer 31

*Diver’s wet or dry suit will be towel dried and a whole body frisk will be performed.
*Suit is removed and the diver is dried, another whole body frisk is performed.