Radiation Safety Exam NMTCB Questions with Complete Solutions

accelerator produced radionuclides - Answer-I-123 Ga-67 Tl-201 In-111 Reactor produced radionuclides - Answer-Mo-99/Tc-99m I-131 I-125 Xe-133 Cr-51 Sr-89 Sm-153 P-32 Total radiation dose based on length of exposure - Answer-Total dose=(dose rate)(time) Inverse Square Law - Answer-(Intensity 1)(Distance 1)^2=(Intensity 2)(Distance 2)^2 Half-value layer HVL - Answer-Thickness of material required to reduce radiation intensity to half its original value. Equation for exposure after HVL added - Answer-Intensity=intensity(original)e^-(0.693)(x/HVL) x = the thickness of the shielding material NRC Regs are based on - Answer-Risk-informed, performance based approach in which the NRC will not, for the most part, specify exactly what methods must be used or how frequently radiation safety procedures must be performed. The licensee must develop policies and procedures that ensure NRC requirements are met. Whole-body TEDE - Answer-5rem or 50mSv per year Lens of eye - Answer-15rem or 150mSv per year Organ Tissue dose - Answer-50rem or 500mSv per year General public dose - Answer-0.1rem or 1mSv per year Embryo/fetal dose - Answer-0.5rem or 5mSv for entire pregnancy