In this paper we present an empirical relation for total stopping power keV in terms of total energy (kinetic
energy + rest mass energy) for electrons and positrons from 20 keV to 50000 and have been fitted by a two
parameter approximation. These parameters depend upon the atomic number (Z) of the absorber and are
applicable in absorbers of atomic number from Z=1 to 92. A fairly good agreement has been found between our
simplified values for total stopping power of electrons and positrons for Carbon, Aluminum, Copper, Silver,
Gold, Lead, Iron, Uranium, Germanium, Silicon and Molybdenum and that of Berger and Seltzer calculated
values

Background: Coronary artery disease (CAD) is a worldwide health epidemic. Acute coronary syndrome is a potentially life-threatening condition and patient may die or become disabled in the prime of life. The aim of this study is to determine the risk factors of CAD in young & elderly aged patients in Chhattisgarh. Methods: Total 180 CAD patients admitted in ICCU at CIMS, Hospital, Bilaspur were selected for the study. Among them, 80 were aged between 18 -45 years, and 100 were more than 45 years of age. These patients were evaluated for conventional risk factor contributing to occurrence of CAD. The significance of each risk factor between the groups was calculated by using chi-square test and p<0.05 was taken as significant. Results: The hypertension (20%) , smoking (22%), diabetes mellitus( 11%) and dyslipidemia (8%) were the commonest risk factors in young patients . Overall risk factors were more likely in males compared to females (18 to <45 years, 79%; ≥65 years, 69.1%). Regarding elderly patients, Diabetes Mellitus (21%), hypertension (14%) smoker (17%), kidney disease (11%) and dyslipidemia (9%) were the commonest risk factors. Conclusion: Young patients had a different risk factor profile when compared with older patients. Hypertension and smoking were the commonest risk factors in young patients of coronary artery disease. While Diabetes Mellitus, kidney disease and smoking were found in elderly patients.