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11-4

Chapter 11 - The 'bad science' behind nuclear reactors

Gaseous radioactive waste - Dumped in YOUR neighborhood

Most radioactive products from reactors are or were once a krypton or a xenon gas.  Most of these are radioactive and long-enough-lived that they linger in the air for minutes, hours or years after routine or accidental emissions from reactors.    

What very few people know is that some gases emitted by reactors precipitate - outside of the reactor walls - into dangerous carcinogens in the solid form like the 'bone seeker ' strontium 90 (and its daughter a pituitary gland seeker, Yttrium-90).  Other gases, like krypton-87, are neutron-activators. 

About 8 percent of the elements created in the fission process comprise radioactive noble gases of krypton and xenon.  These gases include:

(kr = krypton; xe=xenon; m=metastable; β = beta; γ=gamma; α=alpha; n=neutron)

  kr85 βγ kr85m kr87 βn kr88 βγ kr89 β kr90 xe131m xe133
γ
xe133m xe135 xe135m xe137 xe138
half-life in days 3905.5           11.93 5.24 2.26        
half-life in hours   4.48 1.27 2.84           9.17      
half-life in minutes         3.15 0.55         15.6 3.9 17.5
conversion: half-life in minutes 5623920 268.8 76.2 170.4 3.15 0.55 17179 7545 3254 550 15.6 3.9 17.5
99% decayed (minutes) 44991360 2150.4 609.6 1363.2 25.2 4.4 137433 60364 26035 4401 124.8 31.2 140
miles traveled on 10mph wind 7498560 358.4 101.6 227.2 4.2 0.73 22905 10060 4339 733 20.8 5.2 23.33
20mph wind 15 million  716.8 203.2 454.4 8.4 1.46 45811 20121 8678 1467 41.6 10.4 46.6
daughter rb85 n->kr86

β->ru87

rb86m rb88 rb89 rb90   ce133 ce134 ce135   cs137  
daughter half-life stable stable   17.8 min 15.54 min 2.91 min       3 million y   30.1 y  
granddaughter       sr88 sr89 sr90              
mRad/yr per pci/m3 - gamma to body 1.34E-03 1.46E-03 9.73E-03 2.37E-03 1.01E-02 7.29E-03 4.76E-04 3.06E-04 9.94E-04 1.86E-03 7.11E-04 1.22E-02 4.13E-03
mRad/yr per pci/m3 - beta to skin 1.61E-05 1.17E-03 5.92E-03 1.47E-02 1.66E-02 1.56E-02 9.15E-05 2.94E-04 2.51E-04 1.81E-03 3.12E-03 1.42E-03 8.83E-03

'miles traveled on 10mph wind' is the distance on a flat plain (i.e. Nebraska) that will be traveled by a plume of gas by the time 99% of the gas decayed, see section 'Buoyancy of radioactive gases from reactors' for more

  • The four main types of radioxenons are Xenon-131m, Xenon 133, Xenon 133m, and Xenon 135. All are beta-emitters and all also emit both x-rays and gamma rays.  There's also Xenon -141, -143 and -144, which have half-lives of just 1.73 seconds, 5.11 milliseconds and 3.88 milliseconds, respectively, and decay into solid-form carcinogenic radioactive isotopes of cerium.  Krypton gases that are not-radioactive are the stable isotopes of Kr-80, 82, 83, 84, and 86.  Xenon-133 is the daughter of Iodine-133 (20.8 hour half life).

  • Long-lived krypton and xenon and argon gases, like krypton 85 and xenon 133, are all heavier than air and thus they settle near the ground (see section titled 'Buoyancy of radioactive gases from reactors').  Because we breathe in air whether it is radioactive or not, humans routinely intake radioactive noble gases from nuclear reactor emissions and leaks from underground nuclear test shafts into our lungs.  In the lungs, these radio-chemicals get absorbed into the bloodstream and because they are soluble in fat they tend to accumulate in our 'fatty' deposits in our bodies where they give off X-ray-like gamma radiation. 

  • Since Kr-87 has a half-life of 1.27 hours, for almost 24 hours it is floating around our communities shooting neutrons into things converting them into radioactive versions.  For example, water can become radioactive flourine-17; oxygen changes nonradioactive oxygen-17 (which is the only oxygen with a nuclear spin!) and the neutrons can turn your cells and fingernails into radioactive cells and radioactive fingernails ...that happens because 'neutron bombardment' is the same force of the universe that makes the atomic reaction in a nuclear reactor!  Kr-87 is an example of a 'delayed neutron,' a fission product that emits neutrons after the 'fission event.'  Interestingly, Kr-87 actually can also decay by beta emission - it actually 'prefers' this method 39 times out of 40 (the other 1 out of 40, or 2.3% of the time, is via neutron decay).   Aftering emitting a beta particle, it turns into solid rubidium-87, which is also a beta-emitter with a half life of 4.7 BILLION years.

  • Fission also creates radioactive isotopes of the noble gas Argon.  Among the longer-lived Isotopes of Argon are Argon-37, with a half-life of about 35 days, and Argon-39, with a half-life of 269 years.   Argon-37, uniquely, can only be produced by a nuclear reaction; it is produced when neutrons bombard rock-fortified calcium.   Argon-39, on the other hand, is regularly produced by nuclear reactors as neutrons convert potassium-39 (into Argon-39) and is also created by cosmic activity.  Although Argon-37 can be a tracer for leaked underground nuclear explosions, it is difficult to detect and measure at low quantities (it later decays to chlorine-37). 

  • Fission and fusion nuclear explosions also create Carbon-14, an unstable isotope (stable carbon predominantly exists as Carbon-12) that can be created by natural processes when Nitrogen-14 is bombarded by cosmic radiation in the form of neutrons.   In reactors, carbon-14 arises when neutrons bombard carbon-13 (13C), nitrogen-14 (14N) or oxygen-17 (17O), which are impurities in coolant, fuels and/or moderators.  Carbon-14 oxides easily into radioactive carbon dioxide, or 14CO2.

  • Nitrogen exists as either Nitrogen-14 or Nitrogen-15.  Elemental Nitrogen, or nitrogen gas, is known as Nitrogen-14, which has an 'isotopic abundance' - meaning it comprises a percentage of total isotope quantity in nature - of 99.643%.   [When you look at a periodic table, it is an arrangement of elements only by atomic number, which is the number of protons.  The atomic weight, however, is the average weight of that element across all naturally-occurring isotopes, or the abundance-weighted average mass of an element.  The word 'Isotope' doesn't necessarily mean anything toxic, or radioactive.  Everything created by nature (and human) is an isotope.  All elements exist only as isotopes.  Many elements exist as many different isotopes, however not all do.  Elemental sodium only exists naturally as Sodium-23.   There are stable and unstable (radioactive) isotopes existing in nature.  The unstable (radioactive) naturally occurring isotopes include all elements with an atomic number of 84 or greater (after elemental Bismuth).] 

  • Tritium, which is also written as H3 or T, is an isotope of hydrogen and most commonly is created from the neutron bombardment of boron-10 (10B; used as a 'neutron absorber') that is found in reactor primary coolant.  Tritium can also be created by neutron irradiation of hydrogen (2H), helium (3He), and lithium (6Li).  Tritium easily attaches to oxygen to create tritiated water.  Tritiated water is normal water (H20) with the 2 hydrogen atoms replaced by the 3 hydrogen atoms in tritium and written as THO, T20 or 3H20.  (Deuterium is 'heavy' hydrogen, or a hydrogen atom with an extra neutron.  Lithium deuteride has six 'nucelons.') 

     


Buoyancy of radioactive gases from reactors

Routine gaseous releases from nuclear power plant exhaust stacks consist of radioactive isotopes of water (tritium), carbon, argon, xenon and krypton.  The xenon and krypton radioactive gases often include isotopes that are precursors to solid radionuclides such as Strontium-89, Strontium-90, Cerium-141, Cerium-143, Cerium-144, Cesium-135 and Cesium-137.   

The distance at which solid radionuclides land from a nuclear reactor depends, in part, on the gas density, wind direction, speed, heat, stack height, etc...

Let's examine gas density. Most radioactive gases are heavier than air.  A rare radioactive gas that's lighter than air is carbon-14, which occurs both from natural and human-made (pollution) processes.  Carbon-14, however, oxides easily into radioactive carbon-dioxide that settles down to Earth and becomes part of the biosphere.  Common heavy radioactive gases include iodine-131 and krypton-90, which are both created in nuclear explosions and nuclear reactors.  Iodine-131 has a density of 5.85 g/L (it is a very heavy gas) and krypton-90 has a density of 4.0 g/L.    (Dry air has a density of about 1.2 grams per Liter (this is in units of weight per volume)).

To figure the 'buoyancy' of a gas, we use the formula:

buoyancy (per liter of gas) = mass x (1 - (density of air/density of gas))

So, for Kr90, we have   4.0 x (1 - (1/4.0))= 4 x (.75) = 3 grams/Liter  (3 g/L is also written as 3 kilograms/cubic meter)

If Force=Mass X Acceleration, then by multiplying the 'buoyant mass' in one cubic meter (3 kg) by the constant for gravity (9.8 m/s2), we get the number of Newtons of lift, or 29.4 Newtons.

To figure the acceleration (down to the ground), we use the re-written formula [Acceleration=Force/Mass ]. So, if the force is 29.4 N, and the mass (in a cubic meter of Kr90 gas) is 4 kilograms, then acceleration is 7.35 meters per second squared.

So, if krypton 90 is released from a 100 meter high stack from a nuclear reactor, then in zero winds it would take roughly 5 seconds for the krypton 90 to hit the ground.   However, the gases coming out of reactors are at hot temperatures and this substantially increases the volume of the gas.  As a gas expands, the density decreases and the acceleration constant to Earth decreases.  Whether krypton and xenon gases are rising from a fireball from a nuclear explosion or the stack of a reactor, they actually ascend because when they are very hot they are lighter than air, temporarily.  As the gas temperature cools, the density increases, and it begins accelerating back down to Earth.   

Nearly all of the leaked radioactive gas products from a reactor ends up settling in low-lying areas or river valleys downwind. Sometimes these areas 'downwind' can be 5 or 100 miles away from a reactor.  However, winds, weather fronts and other weather conditions can move the pockets of low-lying radioactive air both near and far.   A pocket of radioactive gases can travel over significant territory over weeks and months while its gases take weeks or years to fully decay.  For example, xenon-133 has a half-life of 5.25 days - it is radioactive for over 100 days - and Krypton 85 has a half-life of about 11 years and it is 'hot' for over 200 years.  

We all breathe in this radioactive air - that includes our pets, our farm animals and even edible plants.  In humans, radioactive xenons and kryptons incorporate into our tissues, shooting out gamma rays through our body (even while you're reading this), increasing our risk of cancer, genetic damage and decreasing our immune health.  

You can find out the density of any gas by taking the atomic weight (aka mass) for any isotope, radioactive or not, and dividing it by 22.4 (which is the 'molar volume of a gas' - 22.4 L/mol). 

Toxic gas emissions from reactors located on rivers accumulate in the bottom of the river valley and travel in the downstream direction.  

The specific density of Krypton 90 is 3.107, calculated by divided Mass (gas) by Mass (air) or 90 g/mole/28.96443 g/mole =3 .107 (air=1.0)


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