Realistic dosimetry for studies on biological responses to X-rays and γ-rays

Realistic dosimetry for studies on biological responses to X-rays and γ-rays

A calibration coefficient R (= DA/DE) for photons was employed to characterize the photon dose in radiobiological experiments, where DA was the actual dose delivered to cells and DE was the dose recorded by an ionization chamber. R was determined using the Monte Carlo N-Particle version 5 (MCNP-5) code. Photons with (i) discrete energies, and (ii) continuous-energy distributions under different...

Improved Imaging Plate Dosimetry for X-rays in Interventional Radiology

A new method using imaging plates (IPs) to evaluate patient doses in interventional radiology (IR) procedures is developed. IPs are made of photostimulated luminescence (PSL) materials, are highly sensitive two-dimensional radiation sensors, and can be reused repeatedly. Mapping skin doses in complex fluoroscopy interventions helps determine the probability of a possible injury, helps find area...

Recent progress of avalanche photodiodes in high-resolution X-rays and γ-rays detection

We have studied the performance of large area avalanche photodiodes (APDs) recently developed by Hamamatsu Photonics K.K, in high-resolution X-rays and γrays detections. We show that reach-through APD can be an excellent soft X-ray detector operating at room temperature or moderately cooled environment. We obtain the best energy resolution ever achieved with APDs, 6.4 % for 5.9 keV X-rays, and ...

Preface: High-pressure studies with x-rays.

INTEGRAL probes the morphology of the Crab nebula in hard X - rays / soft γ - rays

Aims. We use the IBIS/ISGRI telescope on board INTEGRAL to measure the position of the centroid of the 20-200 keV emission from the Crab region. Methods. We find that the astrometry of the IBIS telescope is affected by the temperature of the IBIS mask during the observation. After correcting for this effect, we show that the systematic errors on the astrometry of the telescope are of the order ...