Sentences with phrase «large radiation doses»

This has strong implications for astrobiology and planetary habitability as any putative life forms near the surface would be exposed to large radiation doses capable of sterilizing the top ~ 20 cm of the Martian subsurface (Simonsen & Nealy 1993; Mileikowsky et al. 2000; Pavlov et al. 2002; Dartnell 2011; Dartnell et al. 2007a, 2007b, 2010).

«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.

Not exact matches

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

«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.

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.

As Venkat discovered, the second spore coating also offers a secondary benefit: It makes the organism unusually resistant to gamma rays, a form of cosmic radiation that, in large doses, is fatal to men and microbes alike.

«The predictions were correct to within one - tenth of a millirem in terms of potential dose to a person, which is similar to the radiation dose a large man gets from the natural potassium in his own body over the course of a day,» Hayes says.

They mostly just go through us, but because of their large numbers contribute about 1/6 of our normal radiation dose.

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.

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.

In the largest prospective study to date, following women for 8 years post treatment, 81 women were asked to hold their breath during radiation treatment for breast cancer - a process that was repeated until therapeutic dose was reached.

They also point out that one of the most significant Solar Energetic Particle (SEP) events happened in September 2017 releasing large doses of radiation that could pose significant risk to both humans and satellites.

«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.

People who have been exposed to large doses of radiation to the head face a small risk of later developing brain tumors.

Serrano and her colleagues estimated the time needed to obtain the recommended doses — which is equivalent to a daily intake of 1,000 IUs (international units) of vitamin D — in an area such as the city of Valencia, which receives a large dose of UV radiation throughout the year.

Koyuncu discovered this when she infected isolated axons with a small number of virus particles, which would normally travel to the cell bodies and be silenced, while simultaneously exposing the cell bodies to a large number of inactivated virus particles that have been dosed with ultraviolet radiation (UV).

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).

When a person talks on a cell phone or looks at a smartphone display, the eyes receive a large dose of microwave radiation.

The opposite of hyper is hypo and oncologists often use a few large doses of radiation to treat tumors that can not be removed by surgery.

The Act arises from a letter from a group of health physicists who pointed out that the limited understanding of low - dose health risks impairs the nation's decision - making capabilities, whether in responding to radiological events involving large populations such as the 2011 Fukushima accident or in areas such as the rapid increase in radiation - based medical procedures, the cleanup of radioactive contamination from legacy sites and the expansion of civilian nuclear energy.