Section 3: Radionuclide Imaging (RNI) and Hybrid Imaging (Including Positron Emission Tomography (PET)

Question 1

The radiographer working in the RNI lab is busy testing the Technetium-99m (99mTc) Sodium pertechnetate that has been eluted from a new generator that morning. The eluate measures 80GBq of activity in the well counter.

a) What is the parent element of 99mTc?

(1 mark)

b) What other element is tested for in the first eluate of a new generator and why?

(2 marks)

Answer 1

a) Molybdenum-99
b) Aluminium - this is found in the generator and above certain levels is toxic to patients (so have to test for safe levels)

Question 2

The radiographer is moving the eluate back into the transfer hatch with some long handled tongs when the glass vial shatters and sprays the room and the radiographer with the radioactive eluate.

Critically discuss the procedure that needs to be followed to address this radiation spill, considering the following:

a) The action the radiographer would have to take initially

(3 marks)

Answer 2

A) - The radiographer has to remain in the spill area and not move until help comes to them.

• they can shout for help, but cannot move until help arrives
• they will also need to clearly communicate with helping staff that there has been a spill to avoid other staff members from getting contaminated

Question 3

b) The decontamination protocol that needs to be followed for both the member of staff and the room

(13 marks)

Answer 3

staff members:
-assess extent with a dosimeter
- remove all contaminated clothing into a bag for storage (get the staff member/ patient to stand in the bag to avoid any contamination) and provide patient gown
- label the bag with the type of radionuclide and store in the radiation bunker - safe until at safe levels
- wash all contaminated areas with soap and water (non-abrasive) with care to be taken around the face and open wounds
- decon90 (2%) hot areas prior to taking a shower then shower
- continue washing with decon90 and showering until the activity is with acceptable levels (you can use the gamma camera to map where the contaminated areas are on the staff member)
- fill in incident form and notify the RPS/RPA for risk assessment depending on the radionuclide involved
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