Results 281 to 290 of about 365,205 (330)

Ultraviolet radiation, melanocytic naevi and their dose-response relationship

British Journal of Dermatology, 1997
Melanocytic naevi on the face and neck of 110 Brisbane secondary school students aged 16-17 years were mapped according to specified regions to investigate the dose-response relationship between ultraviolet (UV) radiation and melanocytic naevi. Highest naevus density occurred in regions receiving a mean UV dose of 0.2-0.4 relative to the vertex while ...
Victor Siskind, Lynn Green, Adèle C. Green, C. Frost, T.D. Nguyen   +4 more
openaire   +3 more sources

Dose-response relationship for radiation therapy of subclinical disease

International Journal of Radiation Oncology*Biology*Physics, 1995
To determine the dose-response relationship for elective treatment of subclinical metastatic deposits and validate a model for metastatic tumor cell burden.The incidence of overt metastases in electively irradiated potential sites of spread from carcinomas of the head and neck, breast, cervix, ovary, lung, and testis, and from melanomas and ...
H. Rodney Withers, Lester J. Peters, Jeremy M. G. Taylor   +2 more
openaire   +3 more sources

DOSE RESPONSE RELATIONSHIPS FOR ACUTE IONIZING-RADIATION LETHALITY

Health Physics, 2003
A review and analysis of the dose response relationship for the probability of acute lethality from prompt or short-term exposure to ionizing radiation is presented. The purpose of this analysis is to provide recommendations concerning estimates of casualties expected from radiation accidents, the use of nuclear weapons, or possible terrorist ...
R. M. Bloom, J. R. Mercier, R. W. Young, G. H. Anno   +3 more
openaire   +3 more sources

THE DOSE‐RESPONSE RELATIONSHIP OF TUMORIGENESIS BY ULTRAVIOLET RADIATION OF 254 nm

Photochemistry and Photobiology, 1988
Abstract— Groups of albino hairless mice, Skh‐hrl, were exposed daily to UVC radiation from low pressure Hg arcs (Philips TUV 40W). These lamps emit predominantly radiation of 254 nm. Three groups of animals were used in the experiments, each receiving a different daily dose.The results were described with the Weibull probability function.
Henricus J. C. M. Sterenborg, J.C. van der Leun, S. C. J. van der Putte   +2 more
openaire   +3 more sources

Dose-Response Relationship in the Yield of Radiation-Induced Free Radicals in Amino Acids [PDF]

Physics in Medicine and Biology, 1963
The electron spin resonance technique has been used to study the production of long-lived radicals in glycine, alanine, valine, aspartic acid and glutamic acid. The yield of radicals as a function of dose was measured, using as a source of radiation 14·3 MeV electrons at a very high dose rate.
J A Simmons, J Rotblat
openaire   +2 more sources

Dose-response relationship for radiation carcinogenesis in the low-dose region [PDF]

International Archives of Occupational and Environmental Health, 1994
Evidence that low-level radiation substantially enhances the effectiveness of repair mechanisms is summarized. This finding destroys the theoretical basis (there is no other basis) for use of a linear-no threshold dose-response relationship to estimate the cancer risk of exposure to low-level radiation. Such a methodology will exaggerate the risk. This
openaire   +2 more sources

A method to adjust radiation dose–response relationships for clinical risk factors

Radiotherapy and Oncology, 2012
Several clinical risk factors for radiation induced toxicity have been identified in the literature. Here, we present a method to quantify the effect of clinical risk factors on radiation dose-response curves and apply the method to adjust the dose-response for radiation pneumonitis for patients with/without pre-existing pulmonary co-morbidities.
Appelt, Ane Lindegaard, Vogelius, Ivan R
openaire   +4 more sources

Dose-Response Relationship in Radiation Therapy of Advanced Carcinoma of the Colon and Rectum

Radiology, 1972
Abstract The effectiveness of different courses of treatment of recurrent or metastatic carcinoma of the colon and rectum with radiation therapy was evaluated in terms of nominal-single-dose-equivalent rets (NSDE). The formula for derivation of the NSDE for each treatment course was easly to apply and fitted well with observed clinical data. It appears
Frank R. Hendrickson, Parviz K. Soleimani, Walid A. Hindo   +2 more
openaire   +3 more sources

Influence of Microdosimetric Quantities on Observed Dose-Response Relationships in Radiation Therapy

Radiation Research, 1990
The steepness of dose-response curves in radiation therapy depends to a large extent on the statistics of cell killing. This is so if the last few clonogenic tumor cells have to be hit or eradicated by other means to cure the patient. The steepness is dependent on the number of clonogenic cells in the tumor and the possible variation in their ...
A. Brahme, L. Lindborg
openaire   +3 more sources

ESTIMATING THE DOSE RESPONSE RELATIONSHIP FOR OCCUPATIONAL RADIATION EXPOSURE MEASURED WITH MINIMUM DETECTION LEVEL [PDF]

Health Physics, 2004
Occupational exposures are often recorded as zero when the exposure is below the minimum detection level (BMDL). This can lead to an underestimation of the doses received by individuals and can lead to biased estimates of risk in occupational epidemiologic studies.
Roy E. Shore, Mimi Y. Kim, Xiangyang Ye, Xiaonan Xue   +3 more
openaire   +2 more sources