days and has an air-kerma strength of 1,659.66 cGycm. The average energy of Iridium-192 is 380 KeV. The calculation method used for this procedure was TG 43 formula. This patient’s prescribed dose is 400cGy for 6 fractions. The critical structures involved in this treatment is, the bladder, rectum, and sigmoid colon. The safety precautions taken prior to delivering the treatment are thorough. Prior to each brachytherapy treatment the therapist and physicist work together to make sure the procedure goes safely. The therapist makes sure the script is signed by the doctor, fills out the time-out that includes the date and time and duration of the procedure, and contacts the doctor when procedure is about to start so that the doctor is present for the exam. The therapist also sets up the room for the patient by taking out the emergency kit incase the radioactive source does not get retracted back into the storage area. The therapist also needs to make sure there is a safe storage container to put the source in incase it does need to be manually taken out of the patient. The therapist double checks his measurements and times for each location the source will be travelling and signs off his measurements. Finally, the physicist makes sure everyone is wearing his or her dosimeter during the treatment and surveys the storagecontainer and patient before and after every treatment.My overall reflection to this procedure was that the procedure itself goes by really fast. However, for the patient, they have to lay in their bed for an hour or two with the uncomfortable cylinder inside them until their plan is ready. This patient was very nervous for her first treatmentand was afraid to move in any way for fear that she should would move the cylinder and ruin her treatment. After her treatment she relaxed quite a bit and realized that it wasn’t so bad. I like all the safety precautions that the clinical site takes to ensure that everything goes smoothly. It amazes me that there is so much detail that goes into a treatment that takes but two to three minutes.