QUESTION 5 IConsideri-'trea 1 {a public restroom used by staff} next to a busy radiographic room with a chest bucky as pictured here. Assume that 20!} patients per week are radiographed on a modern digital image receptor. Write the equation: explain each term: an list the 1values [if you can] you use to calculate the transmission. Justify your choice of values you make and be as complete as possible. QUESTION 6 Using the values you listed in the prior questions: calculate the thickness ofa LEAD barrier needed to protect Area 1 given a source to point of calculation distance of2.5m. QUESTION 7 N Office Electrical g Utility W PET E Up take Office 8 Room S Work Gamma Uncontrolled Area Camera Controlled Corridor Office 6 Gamma Office 7 Camera The controlled corridor next to a PET uptake room as pictured here. Assume that $ patients per day are administered 555MBq of 1OF FDG. Write the equation you would use to calculate the transmission through the barrier and give the values would you use to calculate the transmission? Justify your choices and be as complete as possible. QUESTION 8 Using the information from the previous problem, calculate the required wall thickness in lead needed to control dose in this space. The point to be calculated is 3.5m from the patient chair. Assume an uptake time of 1 hour. QUESTION 9 Calculate the thickness of lead shielding needed to properly shield the uncontrolled, fully occupied office 8 across the hallway from the PET uptake room. Assume a distance of 6m to the shielding location.QUESTION 14 Unattended Parking Lot Employee Bathroom Isocenter Corridor A with seating Outdoor Area Treatment Planning Console Area Waiting Area For the Linac vault from question 13, the 6MV accelerator has a maximum absorbed dose output rate at 1m from the source of 36Gy/minute and the nominal rate used is 18Gy/min. The isocenter is 1m from the source of radiation. The distance from the machine isocenter to 0.3m beyond the barrier at point is 6.3m. Clearly state all your assumptions as you find the barrier thickness in concrete at point A, an outdoor seating area for patients, families and employees. Assume the workload as calculated for the primary wall where the TBI treaments are done. QUESTION 15 P Pd2 400 Scatter transmission equation: B 12 Leakage transmission equation: B O W sec F 10 - WT Find the secondary concrete barrier thickness necessary in the console area if the distance from the isocenter to the point of calculation is 7 m ( = dsec: dj for simplification). Machine is the same as seen in prior Linac questions.QUESTION 10 Unattended Parking Lot Employee Bathroom Isocenter with seating Corridor A Outdoor Area Treatment Planning Console Area Waiting Area We need to design shielding for a linear accelerator that has only 6MV photons and will be used for Stereotactic radiosurgery (SRS), stereotactic body radiotherapy (SBRT), total body irradiation (TBI), intensity modulated/volumetric modulated radiotherapy (IMRT/VMAT) and conventional (3D) treatments What is the total primary workload in Gy/week for the distribution below: Treatment Type # patient treatments/day Average dose/fraction (cGy/fx) Average MU/fraction (MU/fx) SRS 1 2000 10,000 SBRT 2 1000 4,000 TBI 2 200 (at 3m) 1,800 IMRT/VMAT 20 200 700 3D 10 300 300 Average QA 1 400 100 QUESTION 11 For the previous problem, what is the primary workload in Gy/week for the other primary barriers? QUESTION 12 What is the workload in Gy/week for the scatter barrier calculation? QUESTION 13 What is the total workload in Gy/week for the leakage barrier calculation