tailieunhanh - The thin film pva – bromocresol green dosimeter

The thin film PVA (polyvinyl alcohol) - bromocresol green (∼15µm) dosimeter was made for the applications in radiation technology. It’s parameters before and after gamma irradiation have been studied using optical spectrometer UV-VIS JASCO-V-350 and film densitometer X-Rite Model 301. The results show that the specific wavelength of thin film is ∼ 625nm and the sensitivity of thin film dosimeter is ∼ × 10−3 Gy−1 in the dose range from 1 kGy to 140 kGy. The dose response function of dosimeter was clearly described by the theory of energy transfer model. | Communications in Physics, Vol. 23, No. 2 (2013), pp. 179-184 THE THIN FILM PVA – BROMOCRESOL GREEN DOSIMETER NGUYEN VAN DUNG Hanoi University of Minning and Geology Dong Ngac, Tu Liem, Hanoi Received 16 May 2013; revised manuscript received 21 June 2013 Accepted for publication 27 June 2013 Abstract. The thin film PVA (polyvinyl alcohol) - bromocresol green (∼15µm) dosimeter was made for the applications in radiation technology. It’s parameters before and after gamma irradiation have been studied using optical spectrometer UV-VIS JASCO-V-350 and film densitometer X-Rite Model 301. The results show that the specific wavelength of thin film is ∼ 625nm and the sensitivity of thin film dosimeter is ∼ × 10−3 Gy−1 in the dose range from 1 kGy to 140 kGy. The dose response function of dosimeter was clearly described by the theory of energy transfer model. I. INTRODUCTION Polyvinyl alcohol is excellent matrix for radiochromic centres and widely used for high dose dosimetry purpose [1-3]. An important feature of a dosimeter is its dose-response, which is often expressed as a set of exposure calibration factor at different absorbed doses. A desirable characteristic of dosimeter must be the minimal variation in sensitivity over a wide range of doses. The clear PVA films were studied for high dose dosimetry in [4]. The dyed PVA films with multi-wavelengths in absorbance spectrum were also studied [5, 7]. In present work the dose-response of PVA film dyed by bromocresol green is introduced. The sensitivity of the film is determined in a wide range of doses. II. DOSE-RESPONSE OF THE FILMS According the energy transfer model, an interested dosimeter is considered as a collective acting aggregate of numerous identical radiation sensitive elements. These sensitive elements are uniformly distributed in the dosimeter [6]. The gamma irradiation leads to the formation of activated elements from the sensitive ones. The correlation between number of activated elements n(D) at .

• Vật lý
• Communications in Physics
• The thin film PVA – bromocresol green dosimeter
• The thin film PVA
• The theory of energy transfer model
• Energy transfer model
• Film densitometer X Rite Model 301
• Challenges in particle physics and 3 3 1 models
• Particle physics and 3 3 1 models
• Particle theory and field theory models
• The early Universe
• Non standard model neutrino
• The 3 3 1 models in current particle physics
• Current particle physics
• The Standard Model
• The electro weak
• The process of e+e − → µ +µ
• The randall sundrum model
• Supersymmetric model and unparticle physics
• Randall Sundrum model
• Supersymmetric and Unparticle physics
• Handbook of mechanical engineering
• mechanical engineering
• mechanical design
• mechanical materials
• alloy materials
• Energy Technology
• Compact device model for nanoparticle organic memory transistor’s characterization
• Nanoparticle organic memory transistor
• Hybrid integrated circuit
• Hybrid NOMFET CMOS neuromorphic computing circuit
• Microdroplet in T junction microfluidic system
• Experiment and simulation
• T junction microfluidic system
• Lateral channel decrease
• Optical bistability in three level eit configurations
• Three level eit configurations
• Effects of atomic coherence
• OB in V type system
• Dynamical codimension 2 brane
• Warped six dimensional space time
• Codimension 2 brane
• Warped 6D bulk space time
• Coherent diffractive imaging using table top high harmonic generation
• Coherent diffractive imaging
• Table top high harmonic generation
• Growth of single crystals of methylammonium lead mixedhalide perovskites
• Growth of single crystals
• Methylammonium lead mixedhalide perovskites
• Organo lead mixed halide perovskites
• Tuning electronic transport properties
• Zigzag graphene nanoribbons
• Stone wales defect
• Negative differential resistance
• Asymmetric and symmetric ZGNRs
• The transmembrane italian mutant
• The temperature replica exchange molecular dynamics
• TmE22K trimer structure
• Kinetics probably yield
• Electrochemical fabrication of hybrid plasmonic dielectric nanomaterials
• Gold diamond clusters
• Hybrid plasmonic dielectric nanomaterials
• hybrid plasmonic dielectric materials
• Electron microscopy and optical characterization
• X ray absorption fine structure
• BCC crystals studied
• High order expanded debye waller factors
• Debye Waller factors
• Temperature dependent cumulants
• Nonlinear optics in waveguide arrays and photonic nanowires
• Nonlinear optics in waveguide arrays
• Diffractive resonant radiation
• The spectral body of the pulse
• Radion production in high energy photon collisions
• Solve the hierarchy problem
• Energy loss function for lead
• Local field effect
• Adiabatic local density approximation
• First principles calculations shows good agreemen
• Perturbative nonlinear optics in the extreme ultraviolet region
• The extreme ultraviolet region
• Different extreme ultraviole
• Multiple cycle pulses
• Thermodynamic hadron quark phase transition
• Chiral nuclear matter to quark gluon plasma
• Quark gluon plasma
• Equilibrium properties near critical points
• Phase transitions and critical phenomena
• Chirality of light in hybrid modes
• Vacuum clad ultrathin optical fibers
• Ultrathin optical fibers
• Superchiral outside the fiber
• An advanced logarithmic phase mask for extending depth
• Field of hybrid optical systems
• Modulation transfer functions
• Hybrid imaging system
• Hyperon W production in pp collisions at energy 8 tev
• Investigate the hadronization process
• The RICH detector
• The nominal value
• Profile of the 12co(3 2) emission line detected
• The debris disc of 49 ceti
• Require relatively violent
• Generate secondary gas
• Synthesis and optical characterization
• Building block plasmonic gold nanostructures
• Random nano islands
• Random Au nano islands
• Electrochemical performance of Na0
• 44Mno2 synthesized
• Hydrothermal method using as a cathode material
• Sodium ion batteries
• Sodium ion battery
• Stable during cycling