طراحی و ساخت اسپکترومتر نوترونی bonner sphere

PHYSIOLOG Y: BONNER AND BONNER ASCORBIC ACID AND THE GROWTH OF PLANT EMBRYOS By JAMES BONNER AND DAVID BONNER

John Bonner

John Bonner started working on cellular slime molds in 1940 as an undergraduate at Harvard University, and resumed those studies there as a graduate student after the 2nd World War, finishing his PhD in 1947. His first job was in biology at Princeton University, where he has remained ever since: from assistant professor to professor emeritus. He continues to pursue both his laboratory research ...

طراحی و ساخت یک سیستم جدید پرتونگاری نوترونی در رآکتور تحقیقاتی تهران

In order to achieve a thermal neutron beam for neutron radiography applications, a new neutron collimator has been designed, installed and characterized at Tehran Research Reactor (TRR). TRR is a 5 MW, open pool and light water coolant reactor with seven beam tubes. Neutron collimator that is an important part of neutron radiography system was installed in the six inch E beam tube. Collimator d...

Characterization and utilization of a Bonner sphere set based on gold activation foils.

Bonner sphere (BS) sets which use activation foils as the central thermal neutron sensor have advantages over active BS systems in certain environments, for example, pulsed fields, or fields with high photon components. In such environments, they may be the only type of neutron spectrometer which can be used. This paper describes work, using both measurements and calculations, to validate the r...

Progress Towards Bonner Sphere Spectrometry of the INFN-LNL SPES-BNCT

The Legnaro National Laboratories (LNL) of the Italian National Institute of Nuclear Physics (INFN) are developing a neutron source within the SPES-BNCT project. An accelerator-based, high-flux thermal neutron beam facility is planned for the experimental treatment of skin melanoma. Neutrons are produced via the Be(p,n) reaction by bombarding a 1 mm thick beryllium target with 5 MeV protons gen...

Quantifying the geometry correction factor and effectiveness parameter for Bonner sphere spectrometer with He counter

This paper presents the evaluation of the geometry correction factor for calibration of Bonner sphere spectrometer (BSS) equipped with the He counter (typical SP9), based on Monte Carlo simulation. Using the MCNP4C code, geometry factors and effectiveness parameters (d) of a 800 polyethylene sphere (r = 10.16 cm) were calculated for 10 different energies and 3 various distances between the sour...