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[Radionuclide radiation monitoring].

Radionuclide radiation monitors used nowadays can operate fairly well in measuring the parameters of the radiation type for which they are intended and calibrated. However, in many cases (particularly in emergency situations) the detector is exposed at a time to several types of radiation. Under such conditions its readings may be noticeably influenced by concomitant radiation. In view of this fact interpretation of the measurement data is embarrassing. Bearing this in mind, it is advisable that the available monitors be modernized and new ones be devised for mixed radiation with the common equivalent surface thickness amounting to 1 g/cm2 of tissue equivalent substance.

False Negative Reactions↗
PubMed2003

Network-based real-time radiation monitoring system in Synchrotron Radiation Research Center.

The real-time radiation monitoring system (RMS) in the Synchrotron Radiation Research Center (SRRC) has been upgraded significantly during the past years. The new framework of the RMS is built on the popular network technology, including Ethernet hardware connections and Web-based software interfaces. It features virtually no distance limitations, flexible and scalable equipment connections, faster response time, remote diagnosis, easy maintenance, as well as many graphic user interface software tools. This paper briefly describes the radiation environment in SRRC and presents the system configuration, basic functions, and some operational results of this real-time RMS. Besides the control of radiation exposures, it has been demonstrated that a variety of valuable information or correlations could be extracted from the measured radiation levels delivered by the RMS, including the changes of operating conditions, beam loss pattern, radiation skyshine, and so on. The real-time RMS can be conveniently accessed either using the dedicated client program or World Wide Web interface. The address of the Web site is http:// www-rms.srrc.gov.tw.

Computer Communication Networks↗
PubMed1977

Liquid crystal electromagnetic radiation monitor.

Liquid Crystals having color play centered at different temperatures are arranged on metal coated and nonmetal coated dielectric substrates and used to monitor electromagnetic radiation. While both substrates respond to changes in ambient temperature conditions, the metallized substrate will also have temperature changes due to absorbed radiation. The temperature-dependent light scattering properties of the liquid crystals are used as both the temperature measuring mechanism and the indicating mechanism, with the difference between the temperature indications of the two substrates being a measure of the radiation. An experimental model that measures radiation of 1 to 15 mW/cm2 at 2.45 GHz is described.

Calorimetry↗
PubMed2001

Gene expression profiles for monitoring radiation exposure.

Previous demonstrations that the dose, dose rate, radiation quality, and elapsed time since ionising radiation exposure result in variations in the response of stress genes suggest that gene expression signatures may be informative markers of radiation exposure. Defining sets of genes that ate specific for different outcomes of interest will be key to such an approach. A generalised post-exposure prolile may identify exposed individuals within a population, while more specific fingerprints may reveal details of a radiation exposure. Changes in gene expression in human cell lines occur after as little as 0.02 Gy rays, and in peripheral blood lymphocytes alter as little as 0.2 Gy. Diverse genes are also elevated in vivo in mice 24 h after 0.2 Gy irradiation. Ongoing microarray analyses meanwhile continue to identify large numbers of potential biomarkers from varied irradiation protocols. Development of computation-intensive informatics analysis methods will be needed for management of the complex gene expression profiles resulting from such experiments. Although the preliminary data are encouraging, significant work remains before meaningful correlations with risk or practical assessment of exposure can be made by gene expression profiling.

Gene Expression↗
PubMed1976

Update on the independent radiation monitor (IRM).

The new independent radiation monitor (IRM), unlike its predecessor, is a reliable and sensitive safetly device for any radiation therapy room. It shows unequivovally that the beam is on, and it is inexpensive and simple to construct.

Radiation Monitoring↗
PubMed1988

[Improved performance of a waste water radiation monitor].

Gamma ray waste water radiation monitor has been improved by using multichannel analyzer. Maximum permissible concentrations of 125I are one thousandth lower than 51Cr. This condition, the radioactive waste water cannot be pumped out occasionally. Gamma ray energy spectrum is measured by microcomputer based multichannel analyzer by which 125I photo-peak counts is separated from other radionuclide counts. Also detecting vessel is washed with pressured fresh water to prevent contamination.

Environmental Monitoring↗
PubMed1984

[A simple measuring device for monitoring radiation in phototherapy].

A simple low cost device is described for measuring the irradiation intensity used in phototherapy of hyperbilirubinemia in newborns. The spectral selectivity of the sensor is adapted to the most effective wavelength for phototherapy. The device can be calibrated in W/m2. A description of calibration is given. When fluorescent lamps adapted to phototherapy are used, the accuracy of the device can be compared to that of commercially manufactured units. The sensitivity is sufficient to measure differences of irradiance significant for the therapy. The device is suitable to quantify phototherapy of the newborn infant suffering from hyperbilirubinemia.

Humans↗
PubMed2003

Investigation of elevated whole body radiation monitoring results in a research environment.

When a personnel radiation monitoring device (badge) report indicates that a significant, elevated exposure has been received by an individual, an immediate and thorough investigation must be initiated to determine if the exposure is real, identity the source of the exposure, and to take appropriate steps to eliminate or control further exposures. The key points to consider in such an investigation are provided.

Humans↗
PubMed1986

Use of a gated counting method for radiation monitoring at a 45-MeV electron LINAC facility.

A fixed-point radiation monitoring system based on the gated counting method, which was previously reported by us, was constructed for a 45-MeV electron LINAC facility. It was tested under different beam intensities of the accelerator both at the current and repetition rates. It showed excellent dynamic response (from 2.5 X 10(-11) to 1.0 X 10(-8) Sv h-1) to the intensity variation of the radiation source. It was demonstrated that the system was very useful in monitoring an extremely low-level radiation from a pulsed source.

Electrons↗