Objectives:Life evolved in an environment filled with a wide variety of ionizing and non-ionizing radiation. It was previously reported that medical exposures to pregnant women increases the risk of low birth weight. This study intends to investigate the relationship between exposure to ionizing and non-ionizing radiation and the risk of low birth weight.Materials and Methods:One thousand two hundred mothers with their first-term labor (vaginal or cesarean) whose newborns’ history had been registered in neonates’ screening program in Shiraz were interviewed and surveyed. Data collection was performed by the assessment of mother's history of radiography before and during pregnancy, physical examination of the mother for height and weight and weighing and examining the newborn for any diagnosis of disease and anomalies.Results:There were no statistical significant differences between the mean weight of newborns whose mothers had been exposed to some common sources of ionizing and non-ionizing radiations such as dental or non dental radiographies, mobile phone, cordless phone and cathode ray tube (CRT) and those of non-exposed mothers.Conclusions:The findings of this study cast doubt on previous reports, which indicated that exposure to ionizing radiation during pregnancy increased the risk of low birth weight.

The Ramsauer–Townsend effect in hydrogen is used to force the muonic tritium in suggested heterogeneous solid hydrogen–deuterium–tritium (H/D/T) multilayer system to provide resonance muonic deuterium–tritium molecule formation. The written coupled linear point dynamical equations for the suggested system are solved by Monte-Carlo method using "Lsode" computer code. The obtained results for the optimum layer thicknesses and tritium concentration are compared with the results of solid homogeneous deuterium–tritium system in the same physical condition (temperature, density and tritium concentration). It is shown that for the same physical conditions, the muon cycling coefficient of two isotopes of deuterium–tritium (D/T) has only 3% muon cycling coefficient of suggested heterogeneous solid forced H/D/T fusion system. It is shown that with very little tritium concentration (ct = 0.005) the obtained muon cycling rate and coefficient are ~ 120 μs-1 and 165 respectively.

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