Method to calibrate an ionization chamber for measuring indoor radon concentrations with standard gamma-ray sources

Yuzuru Matsumoto, Kenji Tokumori, Toru Iwata, Takeji Sakae, Kenji Ishibashi, Akira Katase

Research output: Contribution to journalArticle

Abstract

Most instruments for measuring radon concentrations in the air should be calibrated using air with known radon concentrations, obtained from a solution of radium. However, safe handling of such a solution of alpha-active elements can be troublesome. Standard gamma-ray sources of low activity are handled more safely and typically used to obtain the absolute detection efficiency of a Ge detector with high accuracy. A new method has been developed to calibrate a radon detector with such sources. A radon exhalation rate for a substance containing a small amount of radium is measured with the radon detector to be calibrated. After this, the vessel containing the radium is sealed so that the radon does not escape from it. The buildup of the activity of 2 14Bi in it is obtained from gamma-ray measurements and gives the radon exhalation rate on the basis of the activity of the standard sources. From the comparison between the two values of the exhalation rate, the radon detector is calibrated. A plane multiwire-electrode ionization chamber is used as a radon detector, and its detection efficiency is calculated from its geometrical form. The radon exhalation rate computed from the calculated efficiency agrees with that determined from the activity of the standard gamma-ray sources within their specified 6% error.

Original languageEnglish
Pages (from-to)1189-1193
Number of pages5
JournalReview of Scientific Instruments
Volume60
Issue number6
DOIs
Publication statusPublished - Dec 1 1989

Fingerprint

Ionization chambers
Radon
ionization chambers
radon
Gamma rays
exhalation
Radium
radium
Detectors
detectors
Safe handling
air
Air
escape
vessels
gamma rays
Electrodes

All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Method to calibrate an ionization chamber for measuring indoor radon concentrations with standard gamma-ray sources. / Matsumoto, Yuzuru; Tokumori, Kenji; Iwata, Toru; Sakae, Takeji; Ishibashi, Kenji; Katase, Akira.

In: Review of Scientific Instruments, Vol. 60, No. 6, 01.12.1989, p. 1189-1193.

Research output: Contribution to journalArticle

Matsumoto, Yuzuru ; Tokumori, Kenji ; Iwata, Toru ; Sakae, Takeji ; Ishibashi, Kenji ; Katase, Akira. / Method to calibrate an ionization chamber for measuring indoor radon concentrations with standard gamma-ray sources. In: Review of Scientific Instruments. 1989 ; Vol. 60, No. 6. pp. 1189-1193.
@article{34bff0af6f2a435fbcfb34b8acf1dce2,
title = "Method to calibrate an ionization chamber for measuring indoor radon concentrations with standard gamma-ray sources",
abstract = "Most instruments for measuring radon concentrations in the air should be calibrated using air with known radon concentrations, obtained from a solution of radium. However, safe handling of such a solution of alpha-active elements can be troublesome. Standard gamma-ray sources of low activity are handled more safely and typically used to obtain the absolute detection efficiency of a Ge detector with high accuracy. A new method has been developed to calibrate a radon detector with such sources. A radon exhalation rate for a substance containing a small amount of radium is measured with the radon detector to be calibrated. After this, the vessel containing the radium is sealed so that the radon does not escape from it. The buildup of the activity of 2 14Bi in it is obtained from gamma-ray measurements and gives the radon exhalation rate on the basis of the activity of the standard sources. From the comparison between the two values of the exhalation rate, the radon detector is calibrated. A plane multiwire-electrode ionization chamber is used as a radon detector, and its detection efficiency is calculated from its geometrical form. The radon exhalation rate computed from the calculated efficiency agrees with that determined from the activity of the standard gamma-ray sources within their specified 6{\%} error.",
author = "Yuzuru Matsumoto and Kenji Tokumori and Toru Iwata and Takeji Sakae and Kenji Ishibashi and Akira Katase",
year = "1989",
month = "12",
day = "1",
doi = "10.1063/1.1140284",
language = "English",
volume = "60",
pages = "1189--1193",
journal = "Review of Scientific Instruments",
issn = "0034-6748",
publisher = "American Institute of Physics Publising LLC",
number = "6",

}

TY - JOUR

T1 - Method to calibrate an ionization chamber for measuring indoor radon concentrations with standard gamma-ray sources

AU - Matsumoto, Yuzuru

AU - Tokumori, Kenji

AU - Iwata, Toru

AU - Sakae, Takeji

AU - Ishibashi, Kenji

AU - Katase, Akira

PY - 1989/12/1

Y1 - 1989/12/1

N2 - Most instruments for measuring radon concentrations in the air should be calibrated using air with known radon concentrations, obtained from a solution of radium. However, safe handling of such a solution of alpha-active elements can be troublesome. Standard gamma-ray sources of low activity are handled more safely and typically used to obtain the absolute detection efficiency of a Ge detector with high accuracy. A new method has been developed to calibrate a radon detector with such sources. A radon exhalation rate for a substance containing a small amount of radium is measured with the radon detector to be calibrated. After this, the vessel containing the radium is sealed so that the radon does not escape from it. The buildup of the activity of 2 14Bi in it is obtained from gamma-ray measurements and gives the radon exhalation rate on the basis of the activity of the standard sources. From the comparison between the two values of the exhalation rate, the radon detector is calibrated. A plane multiwire-electrode ionization chamber is used as a radon detector, and its detection efficiency is calculated from its geometrical form. The radon exhalation rate computed from the calculated efficiency agrees with that determined from the activity of the standard gamma-ray sources within their specified 6% error.

AB - Most instruments for measuring radon concentrations in the air should be calibrated using air with known radon concentrations, obtained from a solution of radium. However, safe handling of such a solution of alpha-active elements can be troublesome. Standard gamma-ray sources of low activity are handled more safely and typically used to obtain the absolute detection efficiency of a Ge detector with high accuracy. A new method has been developed to calibrate a radon detector with such sources. A radon exhalation rate for a substance containing a small amount of radium is measured with the radon detector to be calibrated. After this, the vessel containing the radium is sealed so that the radon does not escape from it. The buildup of the activity of 2 14Bi in it is obtained from gamma-ray measurements and gives the radon exhalation rate on the basis of the activity of the standard sources. From the comparison between the two values of the exhalation rate, the radon detector is calibrated. A plane multiwire-electrode ionization chamber is used as a radon detector, and its detection efficiency is calculated from its geometrical form. The radon exhalation rate computed from the calculated efficiency agrees with that determined from the activity of the standard gamma-ray sources within their specified 6% error.

UR - http://www.scopus.com/inward/record.url?scp=36549092829&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=36549092829&partnerID=8YFLogxK

U2 - 10.1063/1.1140284

DO - 10.1063/1.1140284

M3 - Article

AN - SCOPUS:36549092829

VL - 60

SP - 1189

EP - 1193

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

SN - 0034-6748

IS - 6

ER -