While the effective and absorbed doses are the same for beta and gamma radiation, for alpha and neutron radiation – types that are especially dangerous for the human body –the effective dose has a larger value than the absorbed dose. A measure of the effective dose therefore gives a ...
After World War II, quantitative risk estimates of radiation injury are primarily derived from the atomic bomb survivor Life Span Study. Current understanding of tissue response to radiation has raised doubts about the validity of LNT model at low doses encountered in the practice of diagnostic ...
HOW IS RADIATION EXPOSURE MEASURED? Radiation exposure is measured primarily in Rem (in the US) and the Sievert (SI unit), and is a measure of the radioactive dose absorbed relative to its possible health effects on the body. This is called the “equivalent dose,” and is weighted to acc...
If all this talk of the horrors of radiation has you in a panic, here's something reassuring: Most types of radiation are harmless; even the dangerous kinds won't cause radiation sickness unless you receive a large dose. In fact, any type of emitted energy is basically radiation, like the...
Electromagnetic (EM) radiation, on the other hand, has no mass and travels in waves. EM radiation can range from very low energy to very high energy, and we call this span the electromagnetic spectrum. Within the EM spectrum, there are two types of radiation -- ionizing and non-ionizing....
body each second. That's over one-half million per minute. The resulting radiation strikes billions of our cells each hour. There are two scientific quantities used in the discussion of radiation protection: equivalent dose and effective dose. Neither of these quantities can be directly measured....
Phototherapy, also known as light therapy, functions similarly to sun exposure. It involves controlled bursts of UVA or UVB radiation delivered either in a dermatologist's office or specialized clinic. Phototherapy is typically added to the treatment plan when topical therapies prove less than effectiv...
A change in the Earth’s orbit, many scientists believe, transformed the “Green Sahara” into what is now the largest desert on the planet. While scientists are still trying to find out if the slow shift in orbit had rapid or gradual environmental conse
“Although these are preliminary outcomes, they suggest progressively greater rest efficiency as measured by rest latency and period awake in the night time, and they’re compelling enough that people plan on conducting a more substantial multi-center study upon this topic soon,” says Dr. Heaton...
Primarily because the hours in between are the period when the sun’s radiation is the strongest even during cloudy or snowy days. Moreover, it would be best to consult with a dermatologist about the appropriate sunscreen to use, since different types of skin require different levels of sun ...