Personal Dosimetry for Geriatrics (Old Patients) Udeajah V.N. and Nworie A. Department of Medical Laboratory Science, Ebonyi State University, Abakaliki Email:vakaduja45@gmail.co,nworieamos@yahoo.com

ABSTRACT
Radiation dosimetry is the measurement and calculation of the absorbed dose in matter and tissue resulting from the exposure to indirect and direct ionizing radiation. It is a scientific subspecialty in the fields of health physics and medical physics that is focused on the calculation of internal (Internal dosimetry) and external doses from ionizing radiation.
Dose is reported in gray (Gy) for matter or sieverts (Sv) for biological tissue, where 1 Gy or 1 Sv is equal to 1 joule per kilogram. Non-SI units are still prevalent as well, where dose is often reported in rads and dose equivalent in rems. By definition, 1 Gy = 100 rad and 1 Sv = 100 rem. Interventional radiology and cardiac catheterizations are developing into preferred alternatives to surgical procedures that tend to lead to hospitalization of patients for longer time periods. Inflicting less physical damage due to minimal invasive procedures not only means a decreased
burden to the patient, but society in general also profits when the
patient returns sooner to normal life. The medical application of
radiation, however, requires proper justification and optimization.