Review of U.S. Army Ionizing Radiation Dosimetry System

An accurate calibration of the therapy level radiation dosimetry system has a pivotal role in the accuracy of dose delivery to cancer patients. The two methods used for obtaining a tissue equivalent calibration of the system: air kerma calibration and its conversion to a tissue equivalent value (absorbed dose to water) and direct calibration of the system in a water phantom, have been compared for identical irradiation geometry. It was found that the deviation between the two methods remained within a range of 0% to ?1.7% for the PTW UNIDOS dosimetry system. This means that although the recommended method is in-water calibration, under exceptional circumstances, in-air calibration may be used as well.

Download Full-text

Radiation physics, biology, and protection

Cardiovascular Computed Tomography ◽

10.1093/med/9780198809272.003.0005 ◽

2019 ◽

pp. 45-68

Keyword(s):

Ionizing Radiation ◽

Radiation Dosimetry ◽

Biological Effects ◽

Patient Dose ◽

Radiation Doses ◽

X Rays ◽

Radiation Physics

This chapter describes the interactions of X-rays with matter, the biological effects of ionizing radiation (including estimated dose thresholds), the science behind radiation dosimetry, and principles of protection of people and the environment. It goes on to describe patient dose according to scanner design, scan parameters, and methods to manage and optimize radiation doses.

Download Full-text

FNTD radiation dosimetry system enhanced with dual-color wide-field imaging

Radiation Measurements ◽

10.1016/j.radmeas.2014.05.026 ◽

2014 ◽

Vol 71 ◽

pp. 166-173 ◽

Cited By ~ 14

Author(s):

M.S. Akselrod ◽

V.V. Fomenko ◽

J.A. Bartz ◽

F. Ding

Keyword(s):

Radiation Dosimetry ◽

Wide Field ◽

Dual Color ◽

Dosimetry System ◽

Field Imaging ◽

Wide Field Imaging

Download Full-text

A Study of N-Isopropyl Acrylamide (NIPAM)-Based Polymer Gel Dosimeter by Using Raman Spectroscopy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1107.103 ◽

2015 ◽

Vol 1107 ◽

pp. 103-107 ◽

Cited By ~ 1

Author(s):

Mohd Zulfadli Adenan ◽

Mansor Ahmad ◽

Noramaliza Mohd Noor ◽

Elias Saion

Keyword(s):

Raman Spectroscopy ◽

Radiation Dosimetry ◽

Polymer Gel ◽

Covalent Bonds ◽

Isopropyl Acrylamide ◽

Good Potential ◽

Constant Dose ◽

Dosimetry System ◽

Constant Dose Rate ◽

Radiotherapy Treatment

Polymer gel is a kind of radiation dosimetry system that has been applied widely in radiotherapy treatment. In this study, the samples of NIPAM-based polymer gel which posses a good potential as 3D radiation dosimetry are synthesized. The samples of polymer gel were irradiated up to 20 Gy by using gamma cell instrument with 60Co sources at a constant dose rate. Upon irradiation, then the chemical changes in polymer gel were characterized by using Raman spectroscopy. The polymerization was referred to an increment in Raman intensity at 815 cm-1, assigned for C-C stretching mode of NIPAM polymer gel, as the dose increased. The consumptions of the co-monomers were referred to a decrement in Raman intensities at 1025 cm-1 and 2353 cm-1 assigned for C=C stretching modes of NIPAM and BIS respectively, as the dose increased. Result shows that the amount of carbon single bonds increases while the amount of carbon covalent bonds decreases following irradiation.

Download Full-text