Problem 4 See Attachment 1 Scenario:The local fire department responds to a car

Question

Problem 4 See Attachment 1 Scenario:The local fire department responds to a car explosion in an intersection that occurs as people are walking to the stadium for the playoff game. As the responders approach their electronic dosimeters alarm at 2 mrem/hr. They stop and ask for directions, set up a perimeter and evacuate people from inside the perimeter. Concurrently, they set up an air sampler and establish a control line to allow entry and exit from the controlled zone. 10 points 1. How far away should the perimeter be established? In 2 sentences, explain your answer: 10 points 2. People inside the area are checked for contamination. At what level should they be decontaminated? Based on this class, what instrument probe should be used to check for contamination? 20 points 2. The air sample is collected and taken for gamma analysis. The spectra from the air sample is found in Attachment 1 Identify the radionuclide. List the energies and abundances of the gammas and identify the radionuclide involved. The air sample was collected for 10 minutes at 600 L/min. The net area of the peak between 400 and 500 325 counts. Using the efficiency table for air samples in Attachment 1, calculate the air concentration in pCiL. 20 SA Assume a person is exposed to this air concentration for 15 minutes and the DAC points of the radionuclide is 9(10 5) uci/L, estimate their dose. 20 pointshs. If the peak between 400 and 500 kev is in channel 910 and the peak between 600 and 700 kev is in channel 1201, calculate what channel the Cs-137 peak would be found.

Explanation / Answer

Ans 1.

The perimeter should be established 30 cm from the radiation source. When car explosion occurred, a lot of radiation was released. People should be protected from this radiation.

For this, a perimeter should be established; generally perimeter is established at 30 cm from the radiation source. It is important to note that the perimeter depends on the radiation source.

Perimeter is established at 30 cm because:

Note: If the radiation is between 2-5mrem/hr, then the area is called 'Radiation zone' People are allowed to enter this zone, but should be removed as soon as possible; that is what is happening in the above case. If radiation is higher than 5mrem/hr (i.e. up to 100mrem/hr) then the restricted area is termed as 'High radiation zone'.

Ans 2. People are decontaminated at 2mrem/hr; commonly used instrument used to check for contamination is "semiconductor radiation detection sensor ".

** Please post other parts separately.

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.