Sentences with phrase «radiation dose at»

The large cosmic ray - induced radiation dose at the surface may also prove problematic for future human exploration of Mars (e.g. Saganti et al. 2004).

Not exact matches

Researchers blasted rats with full - body doses of RF radiation (mostly at higher levels than those associated with cell phones) from the time they were born until they were two years old for nine hours a day.

While this may all sound very upsetting, the vast majority of plain x-rays, like the kind you'd have for a broken bone or at the dentist's office, have few lose doses of radiation.

Diagnostic Radiology at Boston Children's is designed to facilitate high - quality and rapid x-ray examinations using the lowest possible radiation doses for your child, no matter her size, age or medical condition.

The radiation dose rate at typical commercial airline flight altitude (35,000 feet) is about 0.003 millisieverts per hour.

«With some of the technological advances in radiation treatments that have occurred in the last five to 10 years, we're beginning to re-look at the issue and ask — can we target the radiation precisely enough and with a high enough dose to knock the cancer back?»

Experts at the Environmental Protection Agency estimated that the dose of radiation that reached the western United States was equivalent to 1/100, 000 the exposure one would get from a round - trip international flight.

«Randomized trials have confirmed the value of radiation dose escalation for prostate tumors, and the potential benefits of larger radiation doses in fewer fractions, are expected to increase the therapeutic efficacy for men with prostate cancer,» said Anders Widmark, MD, a professor of radiation sciences at Umeå University in Umeå, Sweden and lead author of the study.

The detector developed at UNH, known as DoSEN, short for Dose Spectra from Energetic Particles and Neutrons, measures and calculates the absorbed dose in matter and tissue resulting from the exposure to indirect and direct ionizing radiation, which can change cells at the atomic level and lead to irreparable damDose Spectra from Energetic Particles and Neutrons, measures and calculates the absorbed dose in matter and tissue resulting from the exposure to indirect and direct ionizing radiation, which can change cells at the atomic level and lead to irreparable damdose in matter and tissue resulting from the exposure to indirect and direct ionizing radiation, which can change cells at the atomic level and lead to irreparable damage.

At one extreme, the scientists estimated fly ash radiation in individuals» bones at around 18 millirems (thousandths of a rem, a unit for measuring doses of ionizing radiation) a yeaAt one extreme, the scientists estimated fly ash radiation in individuals» bones at around 18 millirems (thousandths of a rem, a unit for measuring doses of ionizing radiation) a yeaat around 18 millirems (thousandths of a rem, a unit for measuring doses of ionizing radiation) a year.

Chesser says some of his group's studies of mice exposed to radioactivity around Chernobyl hint at hormesis: Small exposures over 10 to 45 days, they found, appeared to temper damage from an acute radiation dose delivered in the lab later.

«Dose threshold is a very contentious issue in the radiation community,» says radiation epidemiologist Roy Shore, research head at the Radiation Effects Research Foundation in Hiroshima.

Threats of explosions and dangerously high radiation doses are just some of the risks facing workers trying to avert complete meltdowns at multiple reactors in Japan

«Our preclinical data suggest that combining low doses of these inhibitors will enhance the clinical effects of both drugs as a potential treatment for patients with AML,» says the senior author, Feyruz V. Rassool, PhD, associate professor of radiation oncology at the University of Maryland School of Medicine (UM SOM) and a researcher at the University of Maryland Marlene and Stewart Greenebaum Comprehensive Cancer Center (UMGCCC).

Laboratory experiments on animals indicate that as doses decrease, less and less damage escapes DNA - repair mechanisms, says Yoshihisa Matsumoto, a radiation biologist at the Tokyo Institute of Technology.

Levels detected in a short duration pulse at the plant itself have reached as high as 8,217 microSieverts per hour, or eight times the dose endured in a typical CT scan and four times the normal dose of background radiation in a year.

The imaging software — developed and currently in use only at Cincinnati Children's — mathematically determines the lowest possible radiation dose for the patient before a scan is performed, according to the study led by David Larson, MD, radiology quality and safety director at the medical center and principal architect of the technology.

Presenting these results at the 3rd ESTRO Forum in Barcelona, Spain, today (Monday) Professor James Morris, from the Department of Radiation Oncology, Vancouver Cancer Centre, British Columbia Cancer Agency (BCCA), Vancouver, Canada, will say that the ASCENDE - RT1 trial is the first and only existing trial comparing low - dose - rate prostate brachytherapy (LDR - PB) for the curative treatment of prostate cancer with any other method of radiation therapy delivery.

«Chronic exposure to low - dose radiation at Chernobyl favors adaptation to oxidative stress,» is published in Functional Ecology on Friday 25 April 2014.

Scientists used those data to extrapolate how many excess cancer cases would develop at lower radiation doses.

These include the behaviour of the Italian government in the aftermath of Chernobyl, the basis of decision - making in civil nuclear power in Switzerland and France, and the controversy over the supposed effects of radiation doses to fathers on their offspring at Sellafield (a large case control study, which has recently been published, contradicts the views in the book), and the Black enquiry into childhood leukaemias in the vicinity of the plant.

As part of the Building a Better Explainer project at N.Y.U.'s Studio 20, we decided to create a visual explainer of radiation levels, inspired by some recent presentations over at XKCD and Information is Beautiful.Both compare radiation doses from everyday activities (like eating a banana or flying across the country) to doses near the Fukushima plant, as well as other disasters like Chernobyl.

The patent - pending technology, which uses detectors at the heart of the Large Hadron Collider at CERN alongside world - first radiation - hard CMOS imagers, will reduce dose uncertainties from several centimetres to just a few millimetres.

Recent studies have shown women with cancer in the left breast are at higher risk of heart disease, and that the risk increases proportionately with the dose of radiation the heart is exposed to during treatment.

Additional work recently presented at the 2014 American Society for Radiation Oncology in San Francisco carried the work further in order to determine whether protection from the additional radiation dose in fact translated to a reduction in ischemic heart disease.

«This study draws attention to the common consensus that the use of low - dose CT scans for image guidance for children is important for quality treatment and to ensure treatment accuracy,» said Stephanie A. Terezakis, MD, co-author of the study and assistant professor of radiation oncology and molecular radiation sciences at Johns Hopkins Sidney Kimmel Comprehensive Cancer Center in Baltimore.

A new study by Dr. Guerda Massillon, researcher at the National University of Mexico (UNAM), looked at the properties of various materials called dosimeters that measure radiation doses.

«The radiation dose rates from measurements obtained over the last four years exceeded trends from previous solar cycles by at least 30 percent, showing that the radiation environment is getting far more intense,» said Nathan Schwadron, professor of physics and lead author of the study.

Biophysical studies have shown that the damage arising to cells from an exposure to ionizing radiation declines in a linearly manner with decreasing dose, with some damage still occurring even at the lowest doses.

Significantly, the effect of PARTICLE in limiting the time and extent of the radiation - induced increase in DNA methylation is more pronounced at lower radiation doses than at higher doses.

The safety study sets the stage for phase II clinical trials looking at whether high dose vitamin C is effective at extending overall lifespan and quality of life for patients undergoing radiation and chemotherapy.

AS&E says the radiation dose from a backscatter x-ray, less than 10 microrems, is the same received from natural sources during two minutes of an airplane flight at 30,000 feet.

Chernobyl was directly responsible for at least 56 deaths and as many as 4,000 more, according to the World Health Organization, though other estimates vary, and spread radioactive material as far as the U.K. Three Mile Island has never been conclusively linked to any deaths or health effects, though some individuals may have received radiation doses of as high as 100 millirems.

The paper does not address what Keith Baverstock, a radiation health expert formerly at the World Health Organization and now at the University of Eastern Finland in Joensuu, considers the most important public health question: What were the external and internal doses in the days and months after the release of the radiation?

The gauntlet Juno ran at Jupiter held many chances for catastrophe: The spacecraft might have been knocked out by intense magnetic fields (at that distance, 20 times stronger than Earth's), ionizing radiation (a total dose of 265 rads — more than enough to kill a human being), dust particles from Jupiter's rings (from which the main engine was completely unshielded) or loss of power if the solar arrays were unable to reorient to the sun.

If that goes well, scientists can at last stop fretting about specific milestones and instead lose sleep over Juno's escalating radiation dose.

At Hanford [a decommissioned nuclear production facility in Washington State] they did something called dose reconstruction, where they looked at releases of radiation and the wind patterns and how the wind might have traveleAt Hanford [a decommissioned nuclear production facility in Washington State] they did something called dose reconstruction, where they looked at releases of radiation and the wind patterns and how the wind might have traveleat releases of radiation and the wind patterns and how the wind might have traveled.

To investigate this life - saving stitchwork, Abraham Minsky and colleagues at the Weizmann Institute of Science in Rehovot, Israel, and elsewhere exposed thousands of bugs to high doses of radiation.

«This study, one of only a few large studies to have follow - up beyond five years, demonstrates that patients who have head and neck cancers and who are being treated with radiation therapy alone have improved local - regional control and no increase in late toxicity when radiation therapy is delivered twice a day in two smaller doses which we call hyperfractionation,» said Jonathan J. Beitler, MD, MBA, FASTRO, lead author of the study and professor of radiation oncology, otolaryngology and hematology / medical oncology at the Winship Cancer Institute of Emory University School of Medicine in Atlanta.

Researchers at The University of Texas MD Anderson Cancer Center prospectively evaluated the cardiac function biomarkers brain natriuretic peptide (BNP), troponin - I (TNI), and electrocardiogram (ECG) in 25 patients receiving high - dose conformal radiation therapy for thoracic malignancies.

«Maybe there is a threshold dose below which radiation is not harmful,» says Wolfgang Weiss, head of radiation protection and health at Germany's Federal Office for Radiation Protection in Munich.

Drugs can not reach the tissue at lethal doses because its blood supply is so poor, while radiation treatments depend on oxygen to trigger cell death.

«If we can identify similar genetic loci in people, and if we could find biomarkers for these gene - environment interactions, then perhaps we could develop a simple blood test that identifies people who are at high risk of cancer from low - dose radiation,» says Mao.

They have to piece together such molecular data to reveal whether cell circuitry is disrupted at low radiation doses.

The situation is even clearer for children, who are at greater risk than adults from a given dose of radiation (Figure 4), both because they are inherently more radiosensitive and because they have more remaining years of life during which a radiation - induced cancer could develop.

According to a report from the Institute of Biophysics at the former Soviet Health Ministry in Chelyabinsk the «small but constant doses of radiation» received by residents «have not occurred anywhere else in the world».

Most of the experiments were done under precise conditions, at a wide range of radiation doses and usually for the lifetime of the animals.

For γ - radiation tumorigenesis, 1 - month - old mice were irradiated weekly for 4 weeks with a 1.75 - Gy dose from a 137Cs source (MARK 1 - 30 Irradiator; Shepherd & Associates) at a rate of 1.14 Gy / min.

Phosphorylated ERK1 / 2 and p - AKT were increased in a dose - dependent manner upon exposure to 1.0, 2.0 and 3.0 Gy of radiation at 4 h of post-irradiation (P < 0.01 to 0.0001).

Our radiation oncologists, who are at the forefront of research, have been leaders in developing and evaluating new therapeutic methods that spare healthy tissue and deliver effective doses of radiation over a shorter period of time.