Generation and control of thoron emanated from lantern mantles

Sorimachi, Atsuyuki; Sahoo, Sarata Kumar; Tokonami, Shinji
January 2009
Review of Scientific Instruments;Jan2009, Vol. 80 Issue 1, pN.PAG
Academic Journal
This paper describes the performance of a thoron (220Rn) flowthrough source made of a commercially available lantern mantle. This 220Rn source is easy to construct and operate and has a negligible radon (222Rn) gas generated when the air was passed through the source. We studied the 220Rn concentration generated from the lantern mantles in terms of the variability in concentration associated with both the total weight of the lantern mantles used in the source and the air flow rate used in the experimental chamber. We found that the concentration of 220Rn generated in air ranged from 0.9 to 150 kBq m-3 and exponentially depended on the absolute humidity. The 220Rn concentration increased linearly with increasing total weight of the lantern mantles, but variations in the rate of air flow passed through the source had no influence on the observed 220Rn concentration.


Related Articles

  • A theoretical study on accurate measurements of thoron with airflow-through scintillation cell method. Tang, F.; Zhuo, W.; Zhao, C.; Chen, B.; Xu, Y.; He, L. // Radiation Protection Dosimetry;Nov2010, Vol. 141 Issue 4, p448 

    For accurate measurements of 220Rn concentration with airflow-through scintillation cell method, a theoretical study was performed for discussing the influences of sampling flow rate, volumes of sampling tube and scintillation cell on the measurements. It is found that a high flow rate and a...

  • Performance of NIRS Thoron Chamber System. Sorimachi, Atsuyuki; Tokonami, Shinji; Takahashi, Hiroyuki; Kobayashi, Yosuke // AIP Conference Proceedings;8/7/2008, Vol. 1034 Issue 1, p206 

    In order to carry out thoron sensitivity test for passive radon detectors, a thoron chamber system has been set up at NIRS, Japan. The thoron chamber system consists of four components: the exposure, monitoring, calibration, and humidity control systems, which was mounted in this study due to...

  • Investigation of radon and thoron concentrations in a landmark skyscraper in Tokyo. Inoue, Kazumasa; Hosoda, Masahiro; Tokonami, Shinji; Ishikawa, Tetsuo; Fukushi, Masahiro // Journal of Radioanalytical & Nuclear Chemistry;Dec2013, Vol. 298 Issue 3, p2009 

    The temporal variation of the radon concentration, and the radon and thoron concentrations every 3 months for a year were measured using two types of devices in a landmark skyscraper, the Tokyo Metropolitan Government Daiichi Building. In the measurement of temporal variation of the radon...

  • Separately measuring radon and thoron concentrations exhaled from soil using alphaguard and liquid scintillation counter methods. Yasuoka, Y.; Sorimachi, A.; Ishikawa, T.; Hosoda, M.; Tokonami, S.; Fukuhori, N.; Janik, M. // Radiation Protection Dosimetry;Nov2010, Vol. 141 Issue 4, p412 

    It was shown that radon and thoron concentrations exhaled from soil were separately measured using the AlphaGUARD and liquid scintillation counter (LSC) methods. The thoron concentrations from the RAD 7 were used to create the conversion equation to calculate thoron levels with the AlphaGUARD....

  • A simple technique for studying the dependence of radon and thoron exhalation rate from building materials on absolute humidity. Hassan, Nabil; Tokonami, Shinji; Fukushi, Masahiro // Journal of Radioanalytical & Nuclear Chemistry;Jan2011, Vol. 287 Issue 1, p185 

    Indoor radon and thoron concentrations were dominated with their exhalation rate from building materials. Thus, the evaluation of exhalation rate with highly precise is important. This paper presented a new technique to measure the dependence radon/thoron exhalation rate, from building materials...

  • Simple, discriminative measurement technique for radon and thoron concentrations with a single scintillation cell. Tokonami, Shinji; Yang, Mingli; Yonehara, Hidenori; Yamada, Yuji // Review of Scientific Instruments;Jan2002, Vol. 73 Issue 1, p69 

    A simple, discriminative measurement technique for radon and thoron concentrations is discussed. In this technique, a single scintillation cell is used for both radon and thoron measurements. It consists of two measurements that use the difference of the half life between the two isotopes. Alpha...

  • Comparative study of indoor radon, thoron with radon exhalation rate in soil samples in some historical places at Jaipur, Rajasthan, India. Sharma, Jyoti; Mahur, A. K.; Kumar, Rupesh; Varshney, Rati; Sonkawade, R. G.; Swarup, R.; Singh, Hargyan; Prasad, Rajendra // Advances in Applied Science Research;Apr2012, Vol. 3 Issue 2, p1085 

    As the radon progeny contribute a major part of natural radiation dose to general population, attention has been given to the large scale and long term measurement of radon and its progeny. Recent epidemiological evidence suggests that inhalation of low level radon and its progeny in dwellings...

  • Effect of radon measurement methods on dose estimation. Kávási, Norbert; Kobayashi, Yosuke; Kovács, Tibor; Somlai, János; Jobbágy, Viktor; Nagy, Katalin; Deák, Eszter; Berhés, István; Bender, Tamás; Ishikawa, Tetsuo; Tokonami, Shinji; Vaupotič, Janja; Yoshinaga, Shinji; Yonehara, Hidenori // Radiation Protection Dosimetry;May2011, Vol. 145 Issue 2/3, p224 

    Different radon measurement methods were applied in the old and new buildings of the Turkish bath of Eger, Hungary, in order to elaborate a radon measurement protocol. Besides, measurements were also made concerning the radon and thoron short-lived decay products, gamma dose from external...


    The first Spanish intercomparison exercise for continuous radon monitors was carried out with the participation of nine monitoring systems from eight laboratories. The exposures were carried out in the radon and thoron chambers at the Institute of Energy Techniques (INTE) of the Technical...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics