web analytics

INL Site

Appendix D
Statistical Analysis Results

Table D-1. Results of the Kruskal-Wallace statistical test between INL Site, Boundary, and Distant sample groups by month.

Parameter Pa

Gross Alpha

Quarter

0.0144

October

0.8647

November

0.0169

December

0.0678

Gross Beta

Quarter

0.0311

October

0.2386

November

0.0469

December

0.0508

a. A 'p' value greater than 0.05 signifies no statistical difference between data groups. Values below 0.05 are indicated in red.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table D-2. Statistical difference in weekly gross alpha and gross beta concentrations measured at Boundary and Distant locations.

 

 

Mann-Whitney U test

Parameter

Week

Pa

Gross Alpha

 

October 4

0.35

 

October 11

0.94

 

October 18

0.62

 

October 25

0.28

 

November 1

0.07

 

November 8

0.02

 

November 15

0.43

 

November 21

0.07

 

November 29

0.22

 

December 6

0.17

 

December 13

0.02

 

December 19

0.01

 

December 27

0.13

Gross Beta

 

October 5

0.19

 

October 12

0.01

 

October 19

0.26

 

October 26

1.00

 

November 2

0.57

 

November 9

0.17

 

November 16

0.94

 

November 23

0.03

 

November 30

0.01

 

December 7

0.03

 

December 14

0.01

 

December 21

0.74

 

December 28

0.03

a.     A 'p' value greater than 0.05 signifies no statistical difference between data groups. Values below 0.05 are indicated in red.

 

Radiation in Our World

Radiation has always been a part of the natural environment in the form of cosmic radiation, cosmogenic radionuclides [carbon-14 (14C), Beryllium-7 (7Be), and tritium (3H)], and naturally occurring radionuclides, such as potassium-40 (40K), and the thorium, uranium, and actinium series radionuclides which have very long half lives. Additionally, human-made radionuclides were distributed throughout the world beginning in the early 1940s. Atmospheric testing of nuclear weapons from 1945 through 1980 and nuclear power plant accidents, such as the Chernobyl accident in the former Soviet Union during 1986, have resulted in fallout of detectable radionuclides around the world. This natural and manmade global fallout radioactivity is referred to as background radiation. MORE

Radiation Exposure and Dose

The primary concern regarding radioactivity is the amount of energy deposited by particles or gamma radiation to the surrounding environment. It is possible that the energy from radiation may damage living tissue. When radiation interacts with the atoms of a given substance, it can alter the number of electrons associated with those atoms (usually removing orbital electrons). This is called ionization. MORE