introduction: active personal dosimeters (apds) are well accepted as useful and reliable instruments for individual dosimetry measurements. apds have many advantages compared with passive dosimeters for individual external radiation dose assessments. in routine monitoring, occupational exposure is carried out for verification and demonstration of compliance with the regulatory dose limits. so, ...

Whenmethacholine is inhaledwith total lung capacity inhalations, which is the recommended inhalation pattern for the 5-breath dosimeter method,1 as many as a quarter of asthmatic patients can have a false-negative test result.2 It has been suggested to us that high forced expiratory volume in 1 second (FEV1) could explain negative (dosimeter) methacholine test results in patients with asthma. W...

background: humans beings are continuously exposed to ionizing radiation from natural sources. the main contributors to natural radiation are high-energy cosmic radiation and radioactive nuclides that originates in the earth’s crust. exposure to high levels of radiation can cause serious health effects. in this study an attempt has been made to monitor the levels of environmental background rad...

A radiophotoluminescent glass dosimeter (RGD) is widely used in postal audit system for photon beams Japan. However, proton dosimetry RGDs scarcely owing to a lack of clarity their response beam quality. In this study, we investigated RGD quality establishing suitable linear energy transfer (LET)-corrected protocol therapeutic beam.The was compared with ionization chamber measurement 100–225 Me...

Micelle gel is a radiochromic hydrogel with the potential to be used as a three dimensional (3D) radiation dosimeter. Since an ideal dosimeter should present water equivalent properties, in this study the water equivalence of two formulations of micelle gel has been investigated by calculating electron density, effective atomic number, fractional interaction probabilities, mass attenuation coef...

BACKGROUND The physician's hands are close to the X-ray field in C-arm fluoroscopy-guided pain interventions. We prospectively investigated the radiation attenuation of Proguard RR-2 gloves. METHODS In 100 cases, the effective doses (EDs) of two dosimeters without a radiation-reducing glove were collected. EDs from the two dosimeters-one dosimeter wrapped with a glove and the other dosimeter ...

This work illustrates a procedure to assess the overall accuracy associated with Gamma Knife treatment planning using plugging. The main role of source plugging or blocking is to create dose falloff in the junction between a target and a critical structure. We report the use of MAGAT gel dosimeter for verification of an experimental treatment plan based on plugging. The polymer gel contained in...

Before you begin making measurements the microStar should be calibrated to your specific environment. This process, (i.e. creating a calibration curve) is extremely important as it correlates the optical response from a dosimeter to a known dose in order to establish the sensitivity of the system (measured in counts/dose). Fortunately, this is simple to do and the results can be stored for late...