Hiroshima porcelain pieces provide insight into exposure levels

Scientists are still studying the after-effects of the nuclear disaster caused by an atomic bomb dropped on Hiroshima on August 6, 1945. The amount of neutron fluence, for example, has been calculated from the site to establish what might be a safe level of exposure for humans. (Neutron fluence is the number of neutrons from the blast found per square centimeter.) The advent of nuclear accidents such as Three Mile Island and potential nuclear accidents in the future makes accurate information imperative. But scientists have recently realized that there are discrepancies in earlier estimates and have been looking for ways to resolve them. According to the latest research, the standards for a safe level of exposure to humans might be too conservative.

Analyzing the neutron-induced fission tracks on certain objects found in Hiroshima enables scientists to calibrate the nuclear fluence. Geologist Robert L. Fleischer (Union College in New York), S. Fujita (Radiation Effects Research Institute in Japan), and M. Hoshi (Research Institute for Nuclear Medicine and Biology in Japan) have published their findings on a glass button found near ground zero in Hiroshima in the Health Physics Society Journal.

More recently, Union College geology student Jonathan MacDonald joined the team to determine the track density of fission tracks in porcelain fragments that were also found near ground zero. This study complements the previous work.

At face value, these results are fluence values from a specific bomb event that will hopefully never be used again. These fission events occurred when thermal neutrons from the bomb caused fission in the normal trace amounts of uranium in the material, MacDonald explained. We determined the track density on the exterior glaze (glass), on the outside of one porcelain fragment and in a cross section of the glaze in another.

While the value of the one sample nearly matches the previous estimates, the other one is 2

Contact: Ann Cairns
Geological Society of America

Page: 1 2

Related biology news :

1. New research shows plants can shuffle and paste gene pieces to generate genetic diversity
2. Building the whole cell from pieces
3. Scans link 2 key pieces of schizophrenia puzzle
4. UNC-CH scientists create worlds smallest pieces of ice
5. Environmental jigsaw pieces fall into place
6. Picking prostanoids to provide protection
7. Study by Israeli scientists provides insight on DNA code
8. Adaptive changes in the genome may provide insight into the genetics of complex disease
9. Essential smell gene may provide key to new insect repellents
10. Clemson University spin-off uses corn to make plastics, provide cleaner air
11. Method to visualize gene activity may provide insight into normal development & genome function

Post Your Comments:

(Date:4/17/2017)... MELBOURNE, Florida , April 17, 2017 ... security technology company, announces the filing of its 2016 Annual Report ... Securities and Exchange Commission. ... Report on Form 10-K is available in the Investor Relations section ... well as on the SEC,s website at http://www.sec.gov . ...
(Date:4/11/2017)... , April 11, 2017 No two ... researchers at the New York University Tandon School ... Engineering have found that partial similarities between prints ... used in mobile phones and other electronic devices ... The vulnerability lies in the fact that ...
(Date:4/5/2017)... 4, 2017 KEY FINDINGS The ... at a CAGR of 25.76% during the forecast period ... primary factor for the growth of the stem cell ... MARKET INSIGHTS The global stem cell market ... and geography. The stem cell market of the product ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... ... 2017 , ... A new study published in Fertility and ... in vitro fertilization (IVF) transfer cycles. The multi-center matched cohort study ... comparing the results from the fresh and frozen transfer cohorts, the authors of ...
(Date:10/10/2017)... CA (PRWEB) , ... October ... ... a development-stage cancer-focused pharmaceutical company advancing targeted antibody-drug conjugate (ADC) therapeutics, today ... of targeted HPLN (Hybrid Polymerized Liposomal Nanoparticle), a technology developed in collaboration ...
(Date:10/10/2017)... 2017 International research firm Parks Associates announced today ... the TMA 2017 Annual Meeting , October 11 in ... home security market and how smart safety and security products impact the ... Parks Associates: Smart Home Devices: ... "The residential security market has experienced ...
(Date:10/10/2017)... ... October 10, 2017 , ... The Pittcon Program ... honoring scientists who have made outstanding contributions to analytical chemistry and ... 2018, the world’s leading conference and exposition for laboratory science, which will be ...
Breaking Biology Technology:
Cached News: