In radiography, a dose to patients primarily depends on the Entrance Surface Dose (ESD) and the sensitivity of organs which are irradiated during treatment plan. The main goal of this study is to look into the patient's dose to assess ESD and ED for patients in digital diagnostic radiography examinations for the optimization of radiation protection of the patients who are exposed to radiation dose thereby facing the increasing probability of fatal cancer risk and other biological effects. Patients dosimetry carried out on 15 adult patients (Male-4 and Female-11) of age 20 to 69 years. The IAEA TRS No. 457 dosimetry protocol was followed in accordance with non-invasive kV-meter, DIAVOLT UNIVERSAL T43014-001400, locating at 100 cm from focus to surface distance for measurement of radiological parameters such as kVp and mAs. The ESD has a wide range from 0.05mGy to 0.35 mGy for chest even for the same examination carried out on the patients of different age and gender and the corresponding effective dose lies from 0.01 to 0.04 mSv, additionally, in other parts like L-spine AP, Lat and in foot ESDs are 1.24 mGy, 2.06 mGy and 0.07 mGy respectively with their corresponding EDs are 0.13 mSv, 0.05 mSv and 0.0003 mSv. The ESDs and EDs reported in this study are generally lower than the doses published in literatures.

Analytic radiography is a normal image testing technique which has been utilized for quite a long time. It is recommended by specialists so they can identify any problem in patients' bodies without a cut. Thinking about its wide use, the principle objective of this investigation is to give a top notch picture by keeping the radiation portion as low as conceivable through identifying any variety in quality control (QC) boundaries. In this work, some standard quality control boundaries, for example, voltage exactness, time precision test, tube yield linearity, half value layer (HVL) of x-beam were measured. These quality control (QC) boundaries were estimated by a dosimeter keeping a distance of 100 cm from source. The voltage precision went from 0.31% to 4.67% and the time exactness test went from 0% to 2.29%. The consequences of this investigation show that all the QC boundaries are inside the acceptable level which guarantees the advancement of the low portion conveyed to the patients.

The use of X-ray facilities in calibrating radiation measuring equipment in diagnostic radiology requires an exact knowledge of the radiation field. X-ray spectrums are made narrow beam by proper filtration recommended by several international organizations. In the present study, the experimental determination of X-ray calibration qualities and analysis of conversion coefficients from air Kerma to ambient and personal dose equivalent is carried for X-ray beam irradiator X80-225kV as per ISO narrow spectrum series at Secondary Standard Dosimetry Laboratory (SSDL) in Bangladesh. The X-ray beam involved in half value layer, effective energy, beam homogeneity coefficient and consistency of X-ray production from the generator (kV and mA) is conducted. A discrepancy of half value layer has been observed for N200 beam code by -8.5% which leads to the deviation of effective energy by -7.7% with a standard deviation of 1.3%. The conversion coefficients from the air kerma to dose equivalent that satisfying the condition of ICRU sphere is established to obtain radiation qualities and compared with values referred by other standard laboratories. A deviation of 0.87% has been observed for H*(10) and H¢(0.07) in between ISO and BCRU empirical relation which is insignificant. A set of conversion coefficients for Hp(10) and Hp(0.07) has also been calculated for ICRU four element tissue.