نتایج جستجو برای: semiconductor detectors

تعداد نتایج: 92478  

Journal: :iranian journal of radiation research 0
m. allahverdi department of medical physics, cancer institute, tehran university of medical sciences, tehran, iran m.r. taghizadeh department of radiotherapy, imam khomeini hospital, tehran university of medical sciences, tehran, iran

abstract background: in vivo measurements of applied dose during radiotherapy treatment, is important to ensure accurate dose delivery to patients. uncertainty in dose delivery should fall within ±5% of the prescribed dose as recommended by icru. assessment of dose for radiotherapy applications performed with various types of detectors. in this study, semiconductor diodes were used which have s...

Journal: :iranian journal of medical physics 0
m. taghizadeh dabbagh m.sc. in medical physics, medical imaging center, imam hosein hospital, shahrood college of medical sciences, shahrood, iran. m. allahverdi assistant professor, medical physics dept., cancer institute, imam khomeini hospital, tehran university of medical sciences, tehran, iran. m. esfahani m.sc. in medical physics, cancer institute, imam khomeini hospital, tehran university of medical sciences, tehran, iran. p. haddad associate professor, radiation therapy dept., cancer institute, imam khomeini hospital, tehran university of medical sciences, tehran, iran.

introduction: during radiotherapy, high accuracy in the dose delivery is required because there is a strong  relationship between the absorbed dose, local tumor control and particularly the normal tissue damage. in  many institutions, in vivo dosimetry using diodes is performed to check the actual dose delivered. in general,  the uncertainty in the dose delivered should fall within  ± 5% of the...

Journal: :journal of medical signals and sensors 0
mohsen hajizadeh-safar m ghorbani s khoshkharam z ashrafi

gamma camera is an important apparatus in nuclear medicine imaging. its detection part is consists of a scintillation detector with aheavy collimator. substitution of semiconductor detectors instead of scintillator in these cameras has been effectively studied. in this study, it is aimed to introduce a new design of p-n semiconductor detector array for nuclear medicine imaging. a p-n semiconduc...

Journal: :Microscopy Today 1998

Journal: :IEEE Transactions on Nuclear Science 1978

Journal: :Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 1996

2011
Douglas S. McGregor Kenneth Shultis

In the past few years, there has been an increased interest in the development of alternative neutron detection technologies. Included among many promising alternative neutron detection technologies are semiconductor-based neutron detectors. These detectors are typically small and compact, hence those methods used to characterize large gas-filled neutron detectors are inappropriate. Proposed ar...

2009
D. S. McGregor W. J. McNeil S. L. Bellinger T. C. Unruh J. K. Shultis

Perforated semiconductor neutron detectors are compact diode detectors that operate at low power and can be fashioned to have high thermal neutron detection efficiency. Fabricated from high-purity Si wafers, the perforations are etched into the diode surface with ICP-RIE and backfilled with LiF neutron reactive material. The intrinsic thermal neutron detection efficiency depends upon many facto...

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