Sentences with phrase «of radiation doses»

According to Evaluation of radiation doses and associated risk from the Fukushima nuclear accident to marine biota and human consumers of seafood in the Proceedings of the National Academy of Sciences,

In the Proceedings of the National Academy of Sciences: «Evaluation of radiation doses and associated risk from the Fukushima nuclear accident to marine biota and human consumers of seafood.»

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

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.

«Unfortunately, healthcare providers including physicians, radiologists, and medical imaging technologists are often not aware of radiation doses for common CT scans,» concluded Dr. Leswick.

Although many say the report is well done, the exercise largely depended on modeling of radiation doses rather than on direct measurements of population exposures, and the data were often sub-optimal.

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

(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.)

«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.

«Health - care providers do not fully understand cancer risk from CT scans: Knowledge of radiation dose, associated risks varies among referring physicians, radiologists, and technicians, according to a new study.»

«It is important for healthcare professionals (including referring physicians, radiologists, and technologists) to be aware of radiation dose levels and risks from imaging tests for several reasons, including the ability to weigh the risks and benefits of tests, counsel patients on relevant risks, optimize protocols to minimize radiation dose, and select appropriate protocols to minimize radiation dose.»

With the exception of mammography, there is no federal regulation of radiation dose for medical tests, leaving the appropriate use of heart imaging in the hands of clinicians and imaging facilities.

Now, researchers are hoping to improve this imaging technique, known as molecular breast imaging or breast specific gamma imaging, with better image quality and precise location (depth information) within the breast, while reducing the amount of radiation dose to the patient for these procedures.

Choosing optimal IGRT regimens that spare healthy tissue and organs is a particular concern for pediatric patients to help prevent potential late effects associated with the distribution of the radiation dose and the total radiation dose the patient receives.

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

The selection of a radiation dose is based on considerations of tumor type, tumor location, and on the tolerance of the normal tissues surrounding the tumor.

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.

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.

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 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.

The effects of extended exposure to radiation, however low the dose, were still unknown.

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.

Palliative radiation oncologists like Balboni, treating advanced cases, use doses of radiation that are extremely quick.

Along the way, according to a 2013 study, you'd get dosed with the radiation equivalent of a whole - body CT scan every five to six days, increasing your lifetime cancer risk above the limits set by NASA.

But it takes a higher dose of radiation to zap bacteria than it does to kill pests.

Experts say the dose from the backscatter is negligible when compared with naturally occurring background radiation, but a linear model shows even such trivial amounts increase the number of cancer cases

With the southern sun beating down through clear waters, tropical corals need something to protect their delicate tissues from damaging doses of ultraviolet (UV) radiation.

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

Japanese researchers are about to launch one of the most ambitious epidemiological studies ever attempted on the effects of low - dose radiation.

Among the advances that have already been made are linear accelerators that generate higher - energy radiation beams, and more versatile patient tables that enable radiation doses to be delivered to the tumor from a variety of angles and directions.

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.

APRIL 1960 RADIATION — «With the new measurement of the mean lethal dose for reproductive function of mammalian cells, it is now possible to explain the relatively low mean lethal dose of 400 to 500 roentgens for the entire body.

Assuming that the values and parameters for speed, radiation dose and risk stated above for Stuker are also true for you, dividing your total miles by 3,700,000,000 will give your approximate odds of getting cancer from your flying time.

Among the 600,000 recovery workers and local residents who received a significant dose of radiation, the WHO estimates that up to 4,000 of them, or 0.7 percent, will develop a fatal cancer related to Chernobyl.

«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?»

Studies of atomic bomb victims, nuclear workers and medical radiation patients have allowed scientists to estimate the cancer risk for any particular radiation dose.

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.

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.

Previous studies also demonstrate that moderate hypo - fractionated radiation therapy (HRT), consisting of daily treatment for one month using a larger dose per treatment, provides a similar low risk of recurrence, and may even be lower with HRT than CRT.

Previously, studies have consistently demonstrated that conventionally fractionated high dose external beam radiation therapy (CRT), consisting of daily treatment for two months, decreases prostate cancer recurrence, and improves metastasis - free survival.

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).

«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 half.

The space - based results were a product of CRaTER's ability to accurately gauge the radiation dose of cosmic rays after passing through a material known as «tissue - equivalent plastic,» which simulates human muscle tissue.

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.