A new approach to the detection of concealed nuclear weapons and fissile material aboard cargo containerships is proposed. The ship-based approach removes the constraints of current thinking by addressing the threat of containerized nuclear terror in a novel way. Critical tactical misjudgments exist in currently deployed detection systems, which expose U.S. cities to an act of nuclear terrorism...

A collection of static and mobile radiation sensors is tasked with deciding, within a fixed time interval, whether a moving target carries radioactive material. Formally, this is a problem of detecting weak time-inhomogeneous Poisson signals (target radiation) concealed in another Poisson signal (naturally occurring background radiation). Each sensor locally processes its observations to form a...

The aim of the present study was to perform cytogenetic analysis by means of a semi‑automated micronucleus‑centromere assay in lymphocytes from medical radiation workers. Two groups of workers receiving the highest occupational doses were selected: 10 nuclear medicine technicians and 10 interventional radiologists/cardiologists. Centromere‑negative micronucleus (MNCM‑) data, obtained from these...

background: nowadays, application of nuclear technology in different industries has largely expanded worldwide. proportionately,the risk of nuclear incidents and the resulting injuries have, therefore, increased in recent years. preparedness is an important part of the crisis management cycle; therefore efficient preplanning seems crucial to any crisis  management plan. equipped with facilities...

In this paper, a spatial information-theoretic model is proposed to locate sensors for detecting source-to-target patterns of special nuclear material (SNM) smuggling. In order to ship the nuclear materials from a source location with SNM production to a target city, the smugglers must employ global and domestic logistics systems. This paper focuses on locating a limited set of fixed and mobile...

THE EXISTENCE OF fissionable materials raises the specter of radiation accidents. Partial nuclear reactor core meltdowns have occurred already; the accident at Three Mile Island in 1979 was the fourth such episode to have occurred in America since 1952. Further, “significant release” episodes have taken place in five states, and the potential exists for radiation accidents during storage, trans...

In this paper the emerging critical point in Nuclear Medicine radiation protection are presented. Shielding issues regarding cyclotron installations, as well as safe delivery of radionuclides and management of gaseous effluents are addressed. Manipulation of beta and positron emitting radionuclides is also discussed, with reference to the problem of correct assessment of personal dose to the ex...

Natural sources account for most of the radiation we all receive each year. The nuclear fuel cycle does not give rise to significant radiation exposure for members of the public, and even in two major nuclear accidents – Three Mile Island and Fukushima – radiation has caused no harm to the public. Radiation protection standards assume that any dose of radiation, no matter how small, involves a ...

—The detection of materials or devices for nuclear or radiological weapons of mass destruction is fundamentally important to national safety and security, and detection technologies are necessary both to nd and to verify the location of those materials or devices. To ful ll this task, this paper presents a statistical approach to the detection and location of radioactive target via wireless sen...