Calcium Reactor
Calcium Reactor
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 Octopus Calcium Reactor CR 70 + Reef Aquarium 100 gallon ADDED FEATURES NIB $165.00 Time Remaining: 26d 10h 1m Buy It Now for only: $165.00 |
 REEFTEK CALCIUM REACTOR FOR UP TO 450 GALLON AQUARIUMS WITH EHEIM 1250 PUMP $200.00 Time Remaining: 1d 15h 17m |
 Two Little Fishies KW Reactor 300 Kalkwasser Reactor $63.00 Time Remaining: 22d 14h 6m Buy It Now for only: $63.00 |
 AQUATEK CO2 Regulator NEW COOL TOUCH SOLENOID $64.99 Time Remaining: 4d 13h 23m Buy It Now for only: $64.99 |
 Two Little Fishies Ball Valves 3 4 Inch With Hose Barb $6.99 Time Remaining: 19d 14h 3m Buy It Now for only: $6.99 |
 Octopus Calcium Reactor CR 100 + NEW ADDED FEATURES $198.00 Time Remaining: 26d 7h 7m Buy It Now for only: $198.00 |
 QUAD AQUARIUM PROBE HOLDER $14.99 Time Remaining: 3d 8h 30m Buy It Now for only: $14.99 |
 Geo 618 Calcium Reactor $275.00 Time Remaining: 5d 16h 47m |
 Bubble Magus BM Calcium Reactor C100 AT newest version $99.99 Time Remaining: 5d 16h 54m Buy It Now for only: $99.99 |
 Octopus Calcium Reactor CR 140 + NEW ADDED FEATURES $228.00 Time Remaining: 26d 8h 35m Buy It Now for only: $228.00 |
 Two Little Fishies Ball Valves 5 8 Inch With Hose Barb $4.99 Time Remaining: 26d 14h 1m Buy It Now for only: $4.99 |
 Aqua Medic Dosing Pumps SP 3000 Reefdoser Good condition $45.00 Time Remaining: 20d 14h 51m Buy It Now for only: $45.00 |
 AquaMaxx CR 1 Nano Calcium Reactor Media Not Included $139.99 Time Remaining: 25d 8h 3m Buy It Now for only: $139.99 |
 Two Little Fishies KW Reactor 300 Kalkwasser Reactor $50.00 Time Remaining: 2d 3h 3m Buy It Now for only: $60.00 |
 Marineland Maxi Jet 900 Pro Powerhead 230 1000 GPH $16.87 Time Remaining: 22d 12h 50m Buy It Now for only: $16.87 |
 Two Little Fishies Ball Valves 1 Inch With Hose Barb $12.99 Time Remaining: 3d 16h 24m Buy It Now for only: $12.99 |
 Bubble Magus Dosing Pump BM T01 Brand new $249.99 Time Remaining: 16d 16h 21m Buy It Now for only: $249.99 |
 Super Reef Octopus XP 2000 Cone Skimmer w pump $445.99 Time Remaining: 29d 6h 43m Buy It Now for only: $445.99 |
 Korallen Zucht ZEOvit ZEOmag Magnesium Granulate 1kg $25.99 Time Remaining: 19d 2h 22m Buy It Now for only: $25.99 |
 KNOP Calcium Reactor C $10.50 (3 Bids) Time Remaining: 8h 23m |
 Precision Marine Calcium Reactor RFCa4 Tanks up to 250 gallons Saltwater Tank $275.00 Time Remaining: 23d 7h 58m Buy It Now for only: $275.00 |
 Acro Cal Nano Coral Reef Calcium Reactor FAST SHIPPING $54.95 Time Remaining: 22d 7h 57m Buy It Now for only: $54.95 |
 AquaMaxx Phosphate Out Filter Media GFO 32fl oz $19.99 Time Remaining: 22d 12h 35m Buy It Now for only: $19.99 |
 Two Little Fishies ReBorn Ca Reactor Media 88lbs $20.99 Time Remaining: 28d 2h 11m Buy It Now for only: $20.99 |
 AquaC EV 180 Protein Skimmer with JG fitting $345.00 Time Remaining: 26d 2h 54m Buy It Now for only: $345.00 |
 Carib Sea ARM Calcium Reactor Media 1 Gallon fine $9.99 Time Remaining: 3d 5h 1m |
 AQUAMAXX GFO GRANULAR FERRIC OXIDE 32 OZ 1 QUART PHOSPHATE $18.99 Time Remaining: 3d 13h 4m Buy It Now for only: $18.99 |
 3 Micro Barb Barbed Ball Valve Air Line Drip Doser Control Two Little Fishies $6.95 Time Remaining: 1d 4h 6m Buy It Now for only: $6.95 |
 CaribSea LSM Sulfur Media 1 Gal $25.49 Time Remaining: 29d 11h 38m Buy It Now for only: $25.49 |
 Two Little Fishies Ball Valve w Hose Barbs for 1 Inch $10.49 Time Remaining: 26d 5h 36m Buy It Now for only: $10.49 |
 Virgin Bituminous Coal Based Activated Carbon Saltwater Freshwater Aquariums $5.64 Time Remaining: 18d 18h Buy It Now for only: $5.64 |
 Carib Sea ARM Calcium Reactor Media 1 Gallon Coarse $9.99 Time Remaining: 3d 5h 2m |
 Bubble Magus BM Calcium Reactor C120 AT newest version $120.00 Time Remaining: 23h 11m Buy It Now for only: $120.00 |
 Two Little Fishies Ball Valves 1 2 Inch With Hose Barb $4.50 Time Remaining: 19d 14h 3m Buy It Now for only: $4.50 |
 Korallin Calcium Reactor 1502 Package 2 $611.97 Time Remaining: 9h 52m Buy It Now for only: $611.97 |
 Cobalt Aquatics MJ1200 Multi Purpose Powerhead Pump $35.99 Time Remaining: 20d 7h 46m Buy It Now for only: $35.99 |
 Flow Control Pinch Valve $13.99 Time Remaining: 8d 10h 45m Buy It Now for only: $13.99 |
 Marineland Maxi Jet 1200 Pro Powerhead ML90512 295 1300 GPH UPC 047431905122 $12.99 (1 Bid) Time Remaining: 2d 23h 44m |
 Aquatic Systems Design Dual Chamber Calcium Reactor Good Condition with Pump $300.00 Time Remaining: 27d 11h 4m Buy It Now for only: $300.00 |
 Milwaukee MA957 CO2 Regulator Solenoid Valve Bubble Counter Meter + Tubing $86.95 Time Remaining: 7d 21m Buy It Now for only: $86.95 |
 Brightwell Aquatics Liquid Reef Building Complex 8 1 2 $9.10 Time Remaining: 16d 2h 24m Buy It Now for only: $9.10 |
 D D ROWAlith C+ 6K Calcium Reactor Media 6kg $33.99 Time Remaining: 1d 10h 6m Buy It Now for only: $33.99 |
 CaribSea Florida Crushed Coral Geo Marine Formula 40 $20.99 Time Remaining: 29d 11h 39m Buy It Now for only: $20.99 |
 Coralife endcaps for 1 1 2 T12 endcaps $10.00 Time Remaining: 11h 50m |
 SMS122 pH Controller + Milwaukee C02 Regulator MA957 $191.95 Time Remaining: 19d 3h 27m Buy It Now for only: $191.95 |
 3 Micro Ball Valve Air Line Drip Control Thread x Barb $6.95 Time Remaining: 24d 9h 48m Buy It Now for only: $6.95 |
 AquaC RX 1 Calcium Reactor w Caribsea ARM Dlx CO2 Re $734.49 Time Remaining: 25d 4h 6m Buy It Now for only: $734.49 |
 Two Little Fishies Micro Valve Barb x Barb 1 Per Pa $2.09 Time Remaining: 27d 4h 24m Buy It Now for only: $2.09 |
 Marineland Maxi Jet 400 Pro Powerhead 110 500 GPH $14.61 Time Remaining: 22d 12h 32m Buy It Now for only: $14.61 |
 Coralife endcaps for 1 1 2 T12 endcaps $10.00 Time Remaining: 11h 51m |
 Milwaukee Professional pH ORP Controller SMS125 $199.95 Time Remaining: 18d 9h 20m Buy It Now for only: $199.95 |
 10 ft CO2 Proof Tubing for CO2 Regulators Reactors $3.99 Time Remaining: 1d 13h 36m Buy It Now for only: $3.99 |
 Body for ViaAqua Acro Cal AC 30 Calcium Reactor for Aquarium $39.99 Time Remaining: 6d 4h 3m Buy It Now for only: $39.99 |
 AQUATEK CO2 Regulator Kit NEW COOL TOUCH SOLENOID $66.49 Time Remaining: 3d 4h 15m Buy It Now for only: $66.49 |
 Brightwell NeoMag Magnesium Media 22 lbs $8.39 Time Remaining: 9h 41m Buy It Now for only: $8.39 |
 American Marine Inc Pinpoint Controller $45.00 Time Remaining: 3d 7h 47m Buy It Now for only: $100.00 |
 Cleartides Refugium 360S Full Kit $189.60 Time Remaining: 18d 5h 33m Buy It Now for only: $189.60 |
 ViaAqua Acro Cal Calcium Reactor $61.49 Time Remaining: 16d 4h 51m Buy It Now for only: $61.49 |
 GEO calcium reactor pH probe gland $4.00 Time Remaining: 11d 10h 22m Buy It Now for only: $4.00 |
 WEIPRO PH 2010 PH Controller for Fresh Salt Aquarium $64.00 Time Remaining: 11d 14h 36m Buy It Now for only: $64.00 |
 Two Little Fishies KW Kalkwasser Reactor 300 $78.75 Time Remaining: 20d 6m Buy It Now for only: $78.75 |
 Midwest Aquatic Sulfur Denitrifier Denitrator FISH TANK Equipment $170.00 Time Remaining: 4d 18h 47m Buy It Now for only: $200.00 |
 Nitrate Alk Twin Reactor 100 gals 440 l Full Kit $78.96 Time Remaining: 19d 1h 14m Buy It Now for only: $78.96 |
 Nitrate Alk Twin Reactor 40 gals 180 lt Full Kit $63.15 Time Remaining: 19d 1h 20m Buy It Now for only: $63.15 |
 Marineland Maxi Jet 600 Pro Powerhead 160 750 GPH $15.37 Time Remaining: 22d 12h 38m Buy It Now for only: $15.37 |
 Tropic Marin PRO REEF Sea Salt 200 Gallon Mix Bucket $89.99 Time Remaining: 28d 1h 23m Buy It Now for only: $89.99 |
 1395 Gals Aquaculture 11 Tanks Central System 15 Tons Live Sand Coral Reef $17,000.00 Time Remaining: 12d 20h 24m Buy It Now for only: $17,000.00 |
 Sicce Syncra 50 Aquarium Pump $110.00 Time Remaining: 3d 11h 17m Buy It Now for only: $145.00 |
 Living Green Wall Hammer Coral Euphyllia ancora $90.00 Time Remaining: 28d 5h 18m Buy It Now for only: $90.00 |
 EHEIM 1048 Water Pump 158 gph NEW $64.99 Time Remaining: 7d 7h 48m Buy It Now for only: $64.99 |
 American Marine Pinpoint pH Controller $200.00 Time Remaining: 13d 3h 2m Buy It Now for only: $200.00 |
 Two Little Fishies Ball Valve w Hose Barbs for 3 4 $7.39 Time Remaining: 1d 3h 8m Buy It Now for only: $7.39 |
 Marineland Maxi Jet 600 Pro Circulation Powerhead Pump $16.99 Time Remaining: 7d 12h 35m Buy It Now for only: $16.99 |
 250 gallon Salt water tank complete with everything $2,000.00 Time Remaining: 6d 4h 27m Buy It Now for only: $3,000.00 |
 Marineland Maxi Jet 400 Pro Circulation Powerhead Pump $14.99 Time Remaining: 7d 13h Buy It Now for only: $14.99 |
 Living Candy Cane Colony Caulastrea furcata $45.00 Time Remaining: 28d 5h 59m Buy It Now for only: $45.00 |
 Marineland Maxi Jet 1200 Pro Circulation Powerhead Aquarium Fish Pump $21.99 Time Remaining: 14d 8h 17m Buy It Now for only: $21.99 |
 AquaMaxx Replacement Thumb Screw 5 16 18 x 05 Inch $1.00 Time Remaining: 25d 8h 3m Buy It Now for only: $1.00 |
 Epsom Salt Magnesium 250g $1.56 Time Remaining: 29d 44m Buy It Now for only: $1.56 |
 500 Gallon Tropical Fish Tank Aquarium and Stand $8,000.00 Time Remaining: 5d 15h 7m Buy It Now for only: $10,000.00 |
 Precision Marine R30 Refugium $439.99 Time Remaining: 17d 16h 39m Buy It Now for only: $439.99 |
 Tropic Eden Miniflakes Aragonite Sand 30lb Live Coral FREE SHIP $44.88 Time Remaining: 19d 5h 48m Buy It Now for only: $44.88 |
 PH 201 Digital PH Controller Aquarium PH CO2 meter $82.00 Time Remaining: 5d 2h 25m Buy It Now for only: $82.00 |
 6 Micro Barb Barbed Ball Valve Air Line Drip Doser Control Two Little Fishies $12.95 Time Remaining: 1d 4h 13m Buy It Now for only: $12.95 |
 10 ft CO2 Tubing for CO2 Regulator Reactor Diffuser $3.99 Time Remaining: 14h 6m Buy It Now for only: $3.99 |
Strontium-90, with a half-life of 28 years???? help!?
Strontium-90, with a half-life of 28 years, is a waste product from nuclear fission reactors. One of the reasons great care is taken in the storage and disposal of this substance stems from the fact that strontium-90 is, in some chemical respects, similar to ordinary calcium. Thus, strontium-90 in the biosphere, entering the food chain via plants or animals, would eventually be absorbed into our bones. That would be bad.
Compute the decay constant K for strontium-90.
How long must a given quantity of strontium-90 be stored before its radioactivity is reduced by a factor of 1000? (i.e. until only 1/1000 of the original quantity remains)
___________years
About how many times must the radioactivity be cut in half in order for it to be reduced by such a factor of 1000?
How long does it take for exactly that many half-lives to pass?
______years
The decay equation is
A(t) = A(0)e^(-kt)
where A(t) is the amount after t years, A(0) is the initial amount, k is the rate constant, and t is the time in years. Since the half life is 28 years, we have
A(t)/A(0) = 0.5 = e^(-28k)
ln(0.5) = -28k
-0.693147181 = -28k
k = 0.024755256
The time to get to 1/000 of the original amount is
A(t)/A(0) = 0.001 = e^(-0.024755256t)
ln(0.001) = -0.024755256t
t = -6.907755279/(-0.024755256) = 279.04196 years
The number of reductions is
0.5^n = 0.001
n = ln(0.001)/ln(0.5) = 9.965784285
The time for that many half lives to pass is 28(9.965784285) = 279.04196 years
March 10th, 2007 in
Aquarium Supplies | tags: aquarium, calcium, calcium reactor, calcium reactor diy, calcium reactor media, calcium reactor ph, calcium reactor reviews, calcium reactor setup, calcium reactors, diy, reactor, reef