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Measurement of the power, energy, irradiance, or radiant exposure of high-energy, ionizing radiation. Also known as radiation dosimetry.



an area of applied physics that studies the physical values that characterize the effect of ionizing radiation on natural objects (animate and inanimate)—in particular, radiation doses—and the methods and instruments for measuring these amounts.

The development of dosimetry was spurred initially by the need to protect man against ionizing radiation; biological effects that appeared after the irradiation of man were noted soon after the discovery of X rays. The need arose for a quantitative evaluation of the degree of radiation danger. The basic quantitative criterion was taken to be the exposure dose, measured in roentgens and determinable in terms of the amount of atmospheric ionization. The work of Soviet scientists P. N. Lukirskii, V. M. Dukel’skii, D. N. Nasledov, K. K. Aglintsev, and I. V. Poroikov was important in the development of roentgenometry.

With the discovery of radium it was learned that the beta and gamma radiations of radioactive substances bring about biological effects similar to those caused by X-radiation. A danger arose in the isolation, treatment, and use of radioactive compounds in that radioactive substances could get inside the body. Methods were developed for measuring the activity of radioactive sources (the number of decays per second). These methods are the basis of radiometry.

The development and construction of nuclear reactors and charged particle accelerators, the development of nuclear power, and the mass production of radioactive isotopes have led to a great diversity of types of ionizing radiation and to the development of diverse dosimetric instruments (dosimeters).

Research on the biological effects of ionizing radiation on the cellular and molecular levels has brought about the development of microdosimetry, which examines the transfer of radiation energy to the microstructures of matter.


References in periodicals archive ?
EPA 2009) have conducted sex-stratified analyses, and these results are not consistent with the findings of dosimetric studies.
Role of Dosimetric Scaling and Species Extrapolation in Evaluating Risks Across Life Stages.
Electromagnetic Monitoring and Real-Time DMLC Adaptation to Account for Target Rotation During Radiotherapy: First Dosimetric Results, Wu et al.
Dosimetric Impact Due to FlexiShield in Electronic Brachytherapy (eBx) of Breast IORT: A Phantom Study Yongbok Kim, PhD, University of Arizona Cancer Center
In addition, a number of dosimetric studies have quantified the relationship between inhaled styrene and markers of exposure: urinary concentrations of styrene (Ghittori et al.
Five additional publications mentioned Cesium-131 as an accepted treatment for prostate cancer, and two publications specifically discussed the physics and dosimetric profile of Cesium-131 for the treatment of prostate and eye cancers.
The system enables multiple mechanical, dosimetric and imaging QA tests to be conducted, analyzed and reported across the radiotherapy clinic.
The basis for this approach is similar to the principal current basis for dosimetric conversions for interspecies projections of cancer risks: that risks are assumed to be similar across species if the internal time-integrated concentrations of active metabolites are similar across species.
of Moores Cancer Center at University of California, San Diego; and Dosimetric Effects of Non-Symmetric Openings of Multi-Catheter Breast Brachytherapy Applicators, authored by Jay Reiff, Ph.
The delivery is also involved in the verification of the contracting authority and the planning system, including data and dosimetric planning system configuration, security, acceptance testing, user training, design and implementation of periodic safety checks and tests of long-term stability throughout the warranty period.
Further documenting the superior dosimetric performance of Perfexion, a recent multicenter study[sup.
Future research to relate airborne PM to improved dosimetric models will be directed toward defining the population receiving the highest local doses in their tissues, and defining the appropriate particle doses for use in in vitro mechanistic studies.