• How much radiation can the human body take?

    Radiation doses are measured in sieverts; each year we receive an average of 2.4 millisieverts from natural sources such as radon; the threshold for an early death is around 2 sieverts, and death is highly likely at 6 sieverts

  • Scent of a man: Odor-killing machine for hunters may aid terrorists

    A Texas-based company has developed a device for hunters which eliminates human odor, thus allowing hunters to get much closer to their prey unnoticed; trouble is, the same device may be used by terrorists to destroy the odor of explosives, thus allowing them to evade bomb-sniffing dogs at airports

  • Laser decontamination for post-chemical attacks, accident clean-up

    Many building materials — like cement and brick — are extremely porous; getting contaminants off surfaces like these is difficult, since they can inhabit cracks and pores; cleaning up chemical-contaminated structures can be difficult, costly, and time-consuming; what if terrorists attacked an urban center with chemicals? Researchers say the answer is to use laser to decontaminate an area after a terrorist attack or an industrial accident

  • Security specialist: Canada's new airport security scanners a waste of money

    An Israeli airport security experts tells Canadian lawmakers that full-body scanners can be easily fooled, and that they will not prevent explosives from being taken on board; he recommended the adoption of the Israeli approach to air travel security, which combines good intelligence, behavioral profiling, and a “trusted traveler” system

  • A pen-like device as a sensitive explosives detector

    Researchers develop a pen-size explosive detector; the sensitive detector can detect TATP, a peroxide bomb detonator used in many major terror attacks worldwide; the device is a disposable item that can be used by non-experts, like U.S. troops in the field, customs police, regular police, and even environmentalists

  • How safe are the world's nuclear fuel stockpiles?

    There is a lot of weapon-grade nuclear material in the world — 1,600 tons of HEU and 500 tons of separated plutonium; keeping these stockpiles safe will take more than barbed wire; one method is a seal for HEU fuel rods with a pattern of flaws visible on ultrasound scans that cannot be removed without leaving telltale signs; the seals were installed last year in Romania and Pakistan; scientists work on other detection and safety methods

  • TSA joins NYPD in subway baggage screening

    TSA joins BYPD in a trial for screening passengers’ baggage on New York subways; TSA says it does not know how long the agency would run the program, but that mass transit riders should anticipate a TSA presence underground “for the foreseeable future”

  • The U.S. faces severe helium-3 shortages; nuclear detection, science suffer

    The decay of tritium, the radioactive heavy-hydrogen isotope used in nuclear weapons, long produced more helium-3 than could be used; the United States stopped making new tritium in 1988, and so the remaining supply has been dwindling as it decays; the post 9/11 rush to build and deploy radiation detectors, however, increased dramatically the demand on the U.S. declining helium-3 resources — and now scientific research dependent on helium-3 suffers, and soon there will not enough even for security devices

  • They screen pets, don't they?

    The Israeli security authorities are now alerting pet owners that their pets, if they look like “suspicious animals,” may be subjected to X-ray screening before boarding; if the owners refused, the pet would not be allowed on the flight; more than four million pets are flown across the world each year

  • They screen pets, don't they?

    The Israeli security authorities are now alerting pet owners that their pets, if they look like “suspicious animals,” may be subjected to X-ray screening before boarding; if the owners refused, the pet would not be allowed on the flight; more than four million pets are flown across the world each year

  • Weapon-grade fissile material in the world could yield 126,500 nuclear bombs

    The nations of the world together have in their possession about 1.6 million kilograms of highly enriched uranium (HEU) and about 500,000 kilograms of plutonium; it takes only about 25 kilograms of HEU or eight kilograms of plutonium to make a crude nuclear bomb; thus the weapon-grade material now available in the world could yield 64,000 HEU-based bombs and 62,500 plutonium-based bombs

  • Shortcomings in U.S. safeguards of weapon-grade nuclear materials

    Reviews ordered by President Obama have found weaknesses in the U.S. government’s stewardship of its nuclear cache, from weapons to the ingredients and classified information that go into them; before opening the nuclear summit earlier this week, Obama said that “Unfortunately, we have a situation in which there is a lot of loose nuclear material around the world”; this is true for the United States as well

  • Five full-body scanners to be used in Chile to catch drug traffickers

    Chile is deploying full-body scanner at border crossing along its border with Peru to prevent drug smuggling; during a 1-year test period, two million people were scanned, and 51 kilograms of cocaine, carried by 42 different border-crossers, seized

  • NJIT physicist: Terahertz imaging is the ultimate defense against terrorism

    THz imaging systems have an inherent advantage over millimeter wave imaging systems owing to the intrinsically improved spatial resolution that one can achieve with the shorter wavelength THz systems (typically 300 micrometer wavelength) compared to longer wavelength millimeter wave systems; instruments using terahertz imaging are widely used in laboratories and have shown some limited use in commercial applications — but a THz imaging system for security screening of people has not yet reached the market; the NJIT THz device has great promise

  • NYC takes extra measures to protect subway from terror

    The New York City’s subway system is a porous, 24-hour-a-day system with 468 stations and an average of 5 million riders a day; NYC security officials insist the city remains the nation’s No. 1 terror target, and they devote extra resources to protecting Wall Street, the Empire State Building, Brooklyn Bridge. and other high-profile potential targets; their biggest worry — spurred by the recent bombing in Moscow and a foiled plot in New York — is the subway