According to the daily lives of the rays (used in industry,medicine, power generation,etc.) access to the best ways dosimetry becomes very important. Ionizing radiation have adverse biological effects on the cells.To estimate the effects of dose received by each of the tissues of the body must be calculated the dose reseived . Based simulation method for calculating geometry to calculate the dose should be very close to the design and simulation, the dose to be calculated more accurately. Simulated three-dimensional model of the human body or phantom should be similar to that simulates real body. Our research in this area of the phantom head and neck and brain is important areas of the dosimetry calculation , the latest amendments recorded in the MIRD (MIRD15) have simulated. Then calculate the dose of Iodine and Technetium in the spring of treatment or therapy and diagnostic iodine thyroid scan head to different parts of the brain did.

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