Science & Technology - Briefs

 
Last Updated: Saturday 04 July 2015

Radiation detector

A portable device to detect nuclear radiations could soon be available for less than $150

imageA SMALL,PORTABLE and inexpensive device to detect nuclear radiation has been created for public use. The device was developed following the nuclear accident in Fukushima in 2011 as people in Japan were unsure of radiation levels in their homes, food, water and environment. The instrument is a gamma ray spectrometer and can also measure radiations other than nuclear which everyone is exposed to in day-to-day life. The device can even give information about the intensity of the radiation and identify the type of radionuclide (atom with unstable nucleus) emitting it. It can also tell if the radiation levels are dangerous. The radiation detector is not yet commercially available, but is expected to be priced at less than $150. Nuclear Instruments and Methods in Physics Research, November 1

Lack of expression says a lot

People WHO suffer from serious heart or lung ailments have a reduced range of facial expressions. This is particularly true of their ability to express surprise. During a test, 50 adults suffering from shortness of breath and chest pain were shown a humorous cartoon, close-up of a surprised face, and a picture of someone crying. Their reactions were recorded. Results showed that the range of expressions of patients who later developed serious ailments was lower than that of the others. Emergency Medical Journal, July 14

Number game

imageThe number of vertebrae in fast-moving animals has remained more or less the same during the course of evolution. This is because any change would have hampered their speed and proved fatal. Natural selection avoided any such change. A large number of mutations is required to change the number of vertebrae but its shape can change with a single mutation. The number of vertebrae in slow-moving animals has seen a significant variation because their survival is not dependent on their speed. PNAS, July 14

GHG behind low rain in Australia

SOUTH-WESTERN parts of Australia have been facing a decline in rainfall during autumn and winter months since the 1980s. Reasons for this are anthropogenic, says a new model. The model used data recorded during 1981-2012 to study if the impact could have been caused by human-made or natural factors. It concluded that green house gas emissions and ozone depletion are the main culprits.

Nature Geoscience, July 2014

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