Sentences with phrase «radiation doses in»

«Despite the low solar elevations in Antarctica, UV - B radiation doses in late spring during the ozone hole period can be sufficient to induce sunburn, and are about twice as great as those that would have occurred prior to the onset of ozone depletion.

Academic scientists face major obstacles as they try to collate baseline data on radiation doses in the face of the enormous disruption caused by the earthquake and tsunami that hit the country last month.

«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.

This can not be used to make a nuclear bomb, but it gives a lethal radiation dose in close quarters.

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.

How safe is the median lifetime radiation dose in the most contaminated part of the city?

On - board imaging equipment allows precise delivery of the radiation dose in stereotactic treatments.

Any potential thief would receive a disabling and lethal radiation dose in a matter of minutes.

It's more comparable to the background radiation dose in a single day.

Not exact matches

And as a new study published in Health Physics recently explored, everyday foods and objects (yes, even the beloved avocado) emit a very small dose of radiation every hour.

«There are no official dose limits for aircrew in the United States,» the US Centers for Disease control writes in its aircrew safety guidelines on cosmic radiation.

In fact, the National Council on Radiation Protection and Measurements reported in 2009 that air crews have, on average, the highest yearly dose of radiation out of all radiation - exposed workers in the UIn fact, the National Council on Radiation Protection and Measurements reported in 2009 that air crews have, on average, the highest yearly dose of radiation out of all radiation - exposed workers in the Uin 2009 that air crews have, on average, the highest yearly dose of radiation out of all radiation - exposed workers in the Uin the US.

They're also advised to avoid flying when the sun is having a solar particle event, which can deliver a higher dose of radiation in one flight than is recommended for the entirety of a pregnancy.

For example, it is well known that nuclear radiations are dangerous in large doses and this was used as an argument against nuclear power.

Even in small doses, exposure to radiation is problematic for a developing baby and mom.

But scientists still don't know how the human body will react to sustained low - level doses of radiation inherent in space travel.

In fact, it is the accumulation of radiation dose that is the limiting factor for the maximum length of manned space flights.

An extended stay on Mars, with its extremely thin atmosphere, would be lethal due to the high radiation doses, notwithstanding Matt Damon's successful Mars colonization in the movie «The Martian.»

A new screening tool for prostate cancer, the prostate - specific antigen test, enabled doctors to detect it earlier in more men, and patients were flocking to hospitals for low doses of conventional photon radiation.

Mild gastrointestinal and genitourinary toxicity as reported by doctors was observed more frequently in patients getting the higher daily dose, shorter frequency radiation, but no differences were observed in more severe side effects, which were rare (less than 5 percent) with either regimen.

That's about one - third the maximum radiation dose allowed for a nuclear power plant worker in a given year.

For three weeks beforehand, Christine Hill - Kayser, the child's radiation oncologist, worked out with colleagues just how strong a dose to deliver, and where in his pelvic area to direct the beam.

«There was a dogma in radiation oncology that a higher dose would be super lethal,» recalls Suit.

«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?»

(As I explain in my book «Strange Glow: The Story of Radiation,» a millisievert or mSv is a unit of radiation dose that can be used to estimate cancer risk.)

They have found Cephalosporium (fungi that live in highly acidic environments), Euglena and Chlorella (algae that grow in heavy metals), and a cockroach that can survive massive doses of gamma radiation.

Those guidelines in the U.S. are to prevent a significant dose of radiation, roughly 10 millisieverts in a short amount of time.

Conventional radiation with photons gave way to intensity - modulated radiation therapy, or IMRT, in which more precise beams of photons could be moved dozens or hundreds of times with varying intensities, attacking tumors in three dimensions with safer high doses.

«The use of advanced technologies may allow radiation therapy to be delivered in larger doses per treatment safely and potentially translate into an overall survival difference in NSCLC patient populations while improving patient quality of life through an acceleration of treatment courses,» said Dr. Iyengar.

The monkeys were given lethal doses of 5.8, 6.5 or 7.2 grays of whole - body radiation, similar to levels inhaled by Fukushima workers (all the animals received «lethal» doses, but only some resulted in death).

And when all food was grown in the area, radiation doses were 50 to 200 percent higher around the coal plants.

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.

«In an earlier phase I clinical study, our group has shown that increasing the dose of radiation delivered daily with high precision and using image guidance may offset the need for chemotherapy in improving survival, and it may also improve quality of life measures by reducing treatment periods in halIn an earlier phase I clinical study, our group has shown that increasing the dose of radiation delivered daily with high precision and using image guidance may offset the need for chemotherapy in improving survival, and it may also improve quality of life measures by reducing treatment periods in halin improving survival, and it may also improve quality of life measures by reducing treatment periods in halin half.

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 year.

Similar types of more severe cognitive dysfunction are common in brain cancer patients who have received high - dose, photon - based radiation treatments.

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.

The radiation - sensitive rats that received higher doses of radiation had a higher concentration of transporters for the neurotransmitter dopamine, which plays a role in vigilance and attention, says Catherine M. Davis, Ph.D., a postdoctoral fellow in the Department of Psychiatry and Behavioral Sciences and the study's first author.

«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

Johns Hopkins scientists report that rats exposed to high - energy particles, simulating conditions astronauts would face on a long - term deep space mission, show lapses in attention and slower reaction times, even when the radiation exposure is in extremely low dose ranges.

The large number of abnormalities appearing so soon after the accident «would indicate that these children almost certainly received a very high dose of thyroid radiation from inhaled and ingested radioactive iodine,» antinuclear crusader Helen Caldicott wrote in a post on her homepage.

Those results were combined with a measure of exposure to natural doses of radiation in the tooth.

The early cleanup workers faced a higher dose, with the risk of acute radiation sickness, resulting in nausea, low blood cell counts and neurological issues.

The benefit of chemotherapy, in addition to craniospinal radiation, was seen in adult patients with medulloblastoma (MB), including those with localized disease who received high - dose radiation treatment following surgery.

The radiation dose they calculated was 0.66 sieverts, researchers report in the May 31 Science; the agencies» limit for astronauts is 1 sievert.

Measured in millisieverts (mSv), the average radiation dose from an abdominal - pelvic CT is 10 mSv, compared to 0.02 to 0.2 mSv from one chest x-ray, meaning that a radiation dose from a CT scan is best approximated as between that from 100 - 250 chest radiographs.

Reported today in the British Journal of Cancer, the test could enable doctors to monitor the effectiveness of treatments without exposing patients to repeated doses of radiation.

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.

After surgeons used radiation to burn away the tumor, she was switched to interleukin - 2, a naturally occurring protein that, in high doses, sends the body's immune defenses into overdrive.