Abstract:
:In 1980, the NCRP formed Scientific Committee 66 with an assignment to address the subject of "biological effects of ultrasound and exposure criteria." It was recognized that the primary source of exposure to ultrasound was through medical applications and, especially, through procedures employing diagnostic ultrasound. While the risk to patients from these procedures was believed small, it was considered important for users to understand it, in view of the widespread use of diagnostic ultrasound. In proceeding with this assignment, much emphasis has been given to the mechanisms by which ultrasound can bring about changes in biological structures or processes. Thermal effects are possible; the local temperature can rise especially rapidly where ultrasound impinges on bone. From theory for heat production and transport, and by analysis of experimental results with mammals, information has been obtained for guiding users in avoiding harm from temperature elevation. Nonthermal effects, such as capillary rupture, can occur when ultrasound is incident on tissue that normally contains gas-filled cavities, as in adult lung or intestine, or on any tissue containing gaseous contrast agents. Theory from fluid dynamics, together with experimental findings, has led to quantitative guidance for avoiding damage from acoustically activated cavities. It is felt that good practice in applying diagnostic ultrasound is best assured by making it possible for users to be well informed on safety matters so that they can feel justifiably confident in making appropriate choices of operating conditions. A promising and useful approach is in the display of safety information on the diagnostic ultrasound screen, which is now a feature of United States standards.
journal_name
Health Physjournal_title
Health physicsauthors
Nyborg WLdoi
10.1097/00004032-200205000-00004keywords:
subject
Has Abstractpub_date
2002-05-01 00:00:00pages
578-87issue
5eissn
0017-9078issn
1538-5159journal_volume
82pub_type
相关文献
HEALTH PHYSICS文献大全abstract::Ionizing radiation is a known and well-quantified human cancer risk factor, based on a remarkably consistent body of information from epidemiological studies of exposed populations. Typical examples of risk estimation include use of Japanese atomic bomb survivor data to estimate future risk from radiation-related canc...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/HP.0b013e3181b1871b
更新日期:2009-11-01 00:00:00
abstract::Radon progeny are positively charged immediately after formation. A negatively charged electret collects radon progeny atoms which are produced in the diffusion chamber. The detector sensitivity may be increased by using an electret in front of solid state nuclear track detector. Dependence of detection sensitivity on...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/00004032-199512000-00008
更新日期:1995-12-01 00:00:00
abstract::Eight of the most severe cases of acute radiation disease (ARS) known to have occurred in humans (as the result of criticality accidents) had survival times less than 120 h (herein defined as "early death"). These accidents were analyzed and are discussed with respect to the specific accident scenarios and the resulti...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/HP.0b013e31823b4b78
更新日期:2012-04-01 00:00:00
abstract::The current feasibility of protecting emergency responders through bone marrow selective shielding is highlighted in the recent OECD/NEA report on severe accident management. Until recently, there was no effective personal protection from externally penetrating gamma radiation. In Chernobyl, first-responders wore make...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/HP.0000000000000688
更新日期:2017-09-01 00:00:00
abstract::This study was carried out to determine the level of potentially off-damaging infrared (IR) radiation in the iron and steel industry. Determinations of IR radiation were made in different positions in many types of processes. Forging was found to give the highest radiant exposure to the eyes, while workers in electros...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/00004032-198403000-00003
更新日期:1984-03-01 00:00:00
abstract::For decades, radiation protection philosophy and practice have been the domain of professionals trained in the physical and medical sciences. Radiation protection policy was formulated and implemented largely without consultation with or participation by other professional disciplines or the general public. Although, ...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/00004032-200104000-00020
更新日期:2001-04-01 00:00:00
abstract::An analysis and evaluation of 241Am in the whole body of a donor to the U.S. Transuranium Registry (USTR) is presented in five parts. The USTR donor's pertinent medical history, autopsy findings and antemortem evaluations of intake and systemic burden are described in Parts I and II. The donor was a 49-yr-old male Cau...
journal_title:Health physics
pub_type: 杂志文章
doi:
更新日期:1985-10-01 00:00:00
abstract::Radiations accidents involving high exposures require accurate assessment of radiation dose for correct surgical or medical management. Techniques involving computed tomography and antimyosin-antibody scintigraphy were evaluated in an experimental model of acute localized irradiation overexposure to 192Ir. Ten rabbits...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/00004032-200001000-00009
更新日期:2000-01-01 00:00:00
abstract::The Trinity nuclear test, conducted in 1945, exposed residents of New Mexico to varying degrees of radioactive fallout. Companion papers in this issue have detailed the results of a dose reconstruction that has estimated tissue-specific radiation absorbed doses to residents of New Mexico from internal and external exp...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/HP.0000000000001333
更新日期:2020-10-01 00:00:00
abstract::If a large radioactive cloud is produced, sampling may require that an airplane traverse the cloud. A method to predict the absorbed dose to the aircrew from penetrating the radioactive cloud is needed. Dose rates throughout spherically symmetric Gaussian clouds of various sizes, and the absorbed doses from traversing...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/00004032-199906000-00007
更新日期:1999-06-01 00:00:00
abstract::In the summers of 1990 and 1991, outdoor 222Rn detectors were installed for 3 mo in 78 communities across Canada. The 1990 measurements showed large regional variations with the average outdoor levels for the provinces of Manitoba (59 Bq m-3) and Saskatchewan (61 Bq m-3) exceeding the average indoor levels of 55 Bq m-...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/00004032-199402000-00009
更新日期:1994-02-01 00:00:00
abstract::The radiation safety implications following the administration of 131I for the treatment of Grave's disease to a patient undergoing home-based renal dialysis was investigated. External dose-rate measurements from the patient revealed a peak value at around day 2, post administration. The effective half-life was determ...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/01.HP.0000221448.21938.36
更新日期:2006-12-01 00:00:00
abstract::Environmental releases of tritium oxide at a number of Department of Energy nuclear weapons facilities contribute to a significant portion of environmental dose. Several conversion factors are utilized in the estimation of human impact from these releases, e.g., dispersion coefficients, consumption rates, uptake facto...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/00004032-199909000-00007
更新日期:1999-09-01 00:00:00
abstract::Storage of radon-producing material in two silos and two waste pits is one of the major environmental and occupational issues at a former uranium production facility, now a Superfund site. In addition, up to 100 metric tons of thorium is stored on the northeast side of the site. Concentrations of radium up to 17,600 B...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/00004032-199805000-00004
更新日期:1998-05-01 00:00:00
abstract::Thoron (Rn) exhalation from building materials has become increasingly recognized as a potential source for radiation exposure in dwellings. However, few studies have focused on mitigation strategies to reduce exposure from thoron and its progeny. Therefore, the purpose of this study is to (1) determine the reduction ...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/HP.0000000000000566
更新日期:2016-11-01 00:00:00
abstract::Twenty-six white male subjects, who worked with plutonium (239Pu) during World War II at Los Alamos, have been given medical examinations periodically over a period of 42 y to identify potential health effects. Inhalation was the primary mode of Pu exposures. The latest examinations, including urine bioassay and in-vi...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/00004032-199108000-00001
更新日期:1991-08-01 00:00:00
abstract::Decisions on whether to start a therapeutic intervention for management of the Acute Radiation Syndrome (ARS) should be made early after exposure, and it should be based on readily available clinical signs and laboratory parameters. Here, the authors use the minipig to assess if early prediction of the later developin...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/HP.0000000000000456
更新日期:2016-08-01 00:00:00
abstract::At least 350,000 workers at U.S. radiation facilities are being followed up to monitor their mortality experience, with particular reference to cancer. Although these studies are expensive, they are needed from the standpoint of public health and radiation protection; they also provide a useful check that the risk ext...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/00004032-199007000-00007
更新日期:1990-07-01 00:00:00
abstract::There has been concern that living near nuclear installations might increase the risk of cancer, including childhood leukemia, in surrounding communities. Such concern has been voiced by residents in Armstrong and Westmoreland Counties in Western Pennsylvania in conjunction with the operation of two former nuclear mat...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/00004032-200312000-00014
更新日期:2003-12-01 00:00:00
abstract::Data were obtained from the literature for gonad and body weights and for the Pu or Ce content of the gonads and body at death for several laboratory animal species, five human Pu injection cases, and 731 human adults exposed environmentally to Pu in fallout. Data for Pu concentration in gonads, liver, and bone sample...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/00004032-198907001-00012
更新日期:1989-01-01 00:00:00
abstract::The scientific basis for the physical and biological effectiveness of particle radiations has emerged from many decades of meticulous basic research. A diverse array of biologically relevant consequences at the molecular, cellular, tissue, and organism level have been reported, but what are the key processes and mecha...
journal_title:Health physics
pub_type:
doi:10.1097/HP.0b013e31826a5b85
更新日期:2012-11-01 00:00:00
abstract::The immersion doses from external exposure to a Gaussian plume of noble gases accidentally released into the atmosphere have been calculated. A numerical integration procedure employing Gauss-Legendre of 64th order has been used. The numerical procedure allows calculating the dose rate at any downwind horizontal or ve...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/01.hp.0000165448.00478.f9
更新日期:2005-09-01 00:00:00
abstract::Homeowners and researchers frequently estimate the radon concentrations in various areas of the home from a single radon measurement often performed in the home's basement. This study describes the spatial variation of radon concentrations both between floors and between rooms on the same floor. The geometric mean bas...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/00004032-199811000-00007
更新日期:1998-11-01 00:00:00
abstract::We present a theoretical study of the complex relation between radon and its long-lived progeny implanted in glass surfaces. The well known (extended) Jacobi room model, which is normally used to describe radon and its progeny in a room, was transformed into a two-parameter model revealing a linear correlation between...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/00004032-200010000-00006
更新日期:2000-10-01 00:00:00
abstract::The Pantex Plant significantly revised its Radiological Control Manual to improve its usability, streamline plant procedures, and clarify conflicting guidance. This article overviews the process used to develop the new Radiological Control Manual. ...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/00004032-200202001-00007
更新日期:2002-02-01 00:00:00
abstract::The process of nuclear fission, which was discovered in 1938, opened the door to the production of nuclear weapons, which were used in 1945 by the United States against Japan in World War II, and to the detonation of >500 nuclear weapons tests in the atmosphere by the United States, the former Soviet Union, the United...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/HP.0000000000001237
更新日期:2020-04-01 00:00:00
abstract::Small plastic chambers containing alpha track detectors are often used for measuring indoor concentrations of 222Rn. This paper reports an experimental assessment of sources of error in measurements made with alpha track detector-containing chambers. The results demonstrate the feasibility of a nondestructive test for...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/00004032-199510000-00008
更新日期:1995-10-01 00:00:00
abstract::Federal agencies have a variety of roles and responsibilities related to communicating with the public before, during, and after a radiological emergency. To better understand the various efforts currently underway, the Radiation Studies Branch of the Centers for Disease Control and Prevention convened a roundtable of...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/HP.0b013e31822552d7
更新日期:2011-11-01 00:00:00
abstract::Dose rates from contaminated soil and hot particles have been calculated for several organs of a reference human. The calculation was performed using the computer code QAD-CGGP, a point kernel code employing combinatorial geometry for the representation of the human phantom. QAD uses buildup factors based on the geome...
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/00004032-199111000-00010
更新日期:1991-11-01 00:00:00
abstract::A Monte Carlo based method for the conversion of an in-situ gamma-ray spectrum obtained with a portable Ge detector to photon flux energy distribution is proposed. The spectrum is first stripped of the partial absorption and cosmic-ray events leaving only the events corresponding to the full absorption of a gamma ray....
journal_title:Health physics
pub_type: 杂志文章
doi:10.1097/00004032-199802000-00007
更新日期:1998-02-01 00:00:00