[Home]  [Headlines]  [Latest Articles]  [Latest Comments]  [Post]  [Sign-in]  [Mail]  [Setup]  [Help] 

Status: Not Logged In; Sign In

Texas Flood Why America Built A Forest From Canada To Texas Tucker Carlson Interviews President of Iran Mosoud Pezeshkian PROOF Netanyahu Wants US To Fight His Wars RAPID CRUSTAL MOVEMENT DETECTED- Are the Unusual Earthquakes TRIGGER for MORE (in Japan and Italy) ? Google Bets Big On Nuclear Fusion Iran sets a world record by deporting 300,000 illegal refugees in 14 days Brazilian Women Soccer Players (in Bikinis) Incredible Skills Watch: Mexico City Protest Against American Ex-Pat 'Invasion' Turns Viole Kazakhstan Just BETRAYED Russia - Takes gunpowder out of Putin’s Hands Why CNN & Fareed Zakaria are Wrong About Iran and Trump Something Is Going Deeply WRONG In Russia 329 Rivers in China Exceed Flood Warnings, With 75,000 Dams in Critical Condition Command Of Russian Army 'Undermined' After 16 Of Putin's Generals Killed At War, UK Says Rickards: Superintelligence Will Never Arrive Which Countries Invest In The US The Most? The History of Barbecue ‘Pathetic’: Joe Biden tells another ‘tall tale’ during rare public appearance Lawsuit Reveals CDC Has ZERO Evidence Proving Vaccines Don't Cause Autism Trumps DOJ Reportedly Quietly Looking Into Criminal Charges Against Election Officials Volcanic Risk and Phreatic (Groundwater) eruptions at Campi Flegrei in Italy Russia Upgrades AGS-17 Automatic Grenade Launcher! They told us the chickenpox vaccine was no big deal—just a routine jab to “protect” kids from a mild childhood illness Pentagon creates new military border zone in Arizona For over 200 years neurological damage from vaccines has been noted and documented The killing of cardiologist in Gaza must be Indonesia's wake-up call Marandi: Israel Prepares Proxies for Next War with Iran? "Hitler Survived WW2 And I Brought Proof" Norman Ohler STUNS Joe Rogan CIA Finally Admits a Pyschological Warfare Agent from the Agency “Came into Contact” with Lee Harvey Oswald before JFK’s Assassination CNN Stunned As Majority Of Americans Back Trump's Mass Deportation Plan

Science/Tech
See other Science/Tech Articles

Title: Detecting Cesium With Naked Eyes
Source: [None]
URL Source: http://www.sciencedaily.com/releases/2013/03/130311090852.htm
Published: Mar 13, 2013
Author: staff
Post Date: 2013-03-13 07:55:55 by Tatarewicz
Keywords: None
Views: 29

Mar. 5, 2013 — Micrometer-level naked-eye detection of cesium ions, a major source of contamination in the vicinity of radioactive leaks, is demonstrated in a material developed by researchers in Japan.

Radioactive cesium 137 has a half-life of 30.17 years, and its accumulation in organisms in exposed regions, such as around the Fukushima Daiichi nuclear plant, amplifies the hazard it poses. A new material reported by researchers in Japan may help.

"We have developed molecular materials as an optical probe for cesium cation-containing particles with implementation based on simple spray-on reagents and a commonly available fluorescent lamp for naked-eye detection in the solid state," explain Jonathan P Hill, Katsuhiko Ariga and colleagues at the WPI-International Center for Materials Nanoarchitectonics, Tokyo University and the Japan Science and Technology Agency (JST).

The researchers based the probe on changes in the fluorescence of organic compounds called phenols in the presence of alkali metals. They designed a substituted phenol compound with an electron-accepting 4-nitrophenyl ether (4-NPE) group. The compound showed a distinctive green fluorescence in the presence of cesium cations and methanol. In comparison, other alkali metals gave rise to dimmer blue fluorescence.

The researchers noted that the fluorescence peak shifted with increasing cesium concentration so that the probe could be calibrated. The probe was sensitive to cesium concentrations of 1 part per million. This is the concentration naturally occurring in the Earth's crust meaning excess to the norm can be detected.

Alongside molecular dynamics calculations these observations suggested the mechanism behind the fluorescent behavior, for which the geometry of the compound molecules and interactions between different constituents seem key.

As the authors suggest, "The availability of this and other similarly easily implemented tests for environmental contaminants is likely to increase the volume of data regarding rates of contamination around chemical and radiological hazards."

Post Comment   Private Reply   Ignore Thread  

[Home]  [Headlines]  [Latest Articles]  [Latest Comments]  [Post]  [Sign-in]  [Mail]  [Setup]  [Help]