The gray (symbol: Gy) is the unit of ionizing radiation dose in the International System of Units (SI), defined as the absorption of one joule of radiation energy per kilogram of matter. It is used as a unit of the radiation quantity absorbed dose that measures the energy deposited by ionizing radiation in a unit mass of matter being irradiated, and is used for measuring the delivered dose in radiotherapy, food irradiation and radiation sterilization. It is important in predicting likely acute health effects, such as acute radiation syndrome and is used to calculate equivalent dose using the sievert, which is a measure of the stochastic health effect on the human body. The gray is also used in radiation metrology as a unit of the radiation quantity kerma; defined as the sum of the initial kinetic energies of all the charged particles liberated by uncharged ionizing radiation in a sample of matter per unit mass. The gray is an important unit in ionising radiation measurement and was named after British physicist Louis Harold Gray, a pioneer in the measurement of X-ray and radium radiation and their effects on living tissue. The gray was adopted as part of the International System of Units in 1975. The corresponding cgs unit to the gray is the rad (equivalent to 0.01 Gy), which remains common largely in the United States, though "strongly discouraged" in the style guide for U.S. National Institute of Standards and Technology. (Wikipedia).
More Standard Deviation and Variance
Further explanations and examples of standard deviation and variance
From playlist Unit 1: Descriptive Statistics
Determining values of a variable at a particular percentile in a normal distribution
From playlist Unit 2: Normal Distributions
Percentiles, Deciles, Quartiles
Understanding percentiles, quartiles, and deciles through definitions and examples
From playlist Unit 1: Descriptive Statistics
This video explains how to determine a unit vector given a vector. It also explains how to determine the component form of a vector in standard position that intersects the unit circle. http://mathispower4u.yolasite.com/
From playlist Vectors
Dimensions (1 of 3: The Traditional Definition - Directions)
More resources available at www.misterwootube.com
From playlist Exploring Mathematics: Fractals
The Definition of a Linear Equation in Two Variables
This video defines a linear equation in to variables and provides examples of the different forms of linear equations. http://mathispower4u.com
From playlist The Coordinate Plane, Plotting Points, and Solutions to Linear Equations in Two Variables
Mean v Median and the implications
Differences between the mean and median suggest the presence of outliers and/or the possible shape of a distribution
From playlist Unit 1: Descriptive Statistics
The Only Radiation Units You Need to Know
In order to have a meaningful conversation about the dangers of radiation exposure, it’s important to be clear about just how much radiation we are dealing with. Unfortunately, the units we use are kind of a mess… but SciShow is here with the only two you need to know. Hosted by: Michael
From playlist Uploads
CGSR | Deterring Iran in the Gray Zone: Insights from Forty Years of Conflict
Talk Abstract Since the Islamic Revolution of 1979, Iran has emerged as one of the world's foremost gray zone actors, and for more than four decades, the United States has struggled to understand the rather unique requirements of gray zone deterrence. As the United States reduces its mili
From playlist Center for Global Security Research
Becquerel, gray and sievert - measuring radioactivity: from fizzics.org
The units of bequerel, gray and sievert measure activity, absorbed dose and dose equivalent. Taking a precise numerical measurement of the radioactivity of a source is difficult and understanding the various units of measurement is far from straightforward. The video explains the definitio
From playlist Equations and graphs for physics
Determine the Value of Fraction Pieces
This video explains to how determine the value of fraction pieces.
From playlist Introduction to Fractions
The zinc blende crystal structure is the structure named for the low-temperature phase of the ceramic ZnS. It is cubic with two interpenetrating FCC lattices. One at the normal position and one at (1/4,1/4,1/4). Another way to think of it is an FCC lattice with half of its tetrahedral inte
From playlist Materials Sciences 101 - Introduction to Materials Science & Engineering 2020
Learn How to Determine the Unit Vector with the Same Direction as Another Vector
Learn how to determine the unit vector of a vector in the same direction. The unit vector is a vector that has a magnitude of 1. The unit vector is obtained by dividing the given vector by its magnitude. #trigonometry#vectors #vectors
From playlist Vectors
Apes and Academics, Debates and Sermons
Keith S. Thomson delivers the third of four Terry lectures, "Jefferson and Darwin: Science and Religion in Troubled Times." In the last 300 years, science and religion, however construed, have diverged so much as almost no longer to be recognizable to each other, according to Thomson, a
From playlist Terry Lectures
In this video I describe the motivation behind Gray codes, which are a specific way of listing the binary sequences of length n. We also discuss a Graph-Theoretic way of viewing Gray codes. -- Bits of Discrete Math by Dr. Sarada Herke. Related videos: http://youtu.be/X8mnQJ5AlTM - Graph
From playlist Discrete Math part-1
The Great Miami Hurricane of 1926
Miami was the fastest growing city in the nation, in the midst of a great real estate boom. Then nature intervened. At the time, the United States Weather service described the hurricane of September 17 - 20, 1926 as “probably the most destructive storm in the history of the United States
From playlist History and extreme weather
Determining the Unit Normal Vector to a Curve Given by a Vector Function
This video explains how to determine the unit normal vector to a curve defined by a vector valued function. http://mathispower4u.wordpress.com/
From playlist Vectors
Mathematica Experts Live: Visualization
Brett Champion covers Mathematica's new visualization features, including built-in legends, unit visualization, and gauges, in this presentation from Mathematica Experts Live: New in Mathematica 9. For more information about Mathematica, please visit: http://www.wolfram.com/mathematica
From playlist Mathematica Experts Live: New in Mathematica 9
From playlist Belong: What It's Like to Live in the Hyphen
26. Chernobyl — How It Happened
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From playlist MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016