Sensitivity Study of Parameters Influencing Calculations of Fluence-to-Ambient Dose Equivalent Conversion Coefficients for Neutrons

1994 ◽  
Vol 54 (3-4) ◽  
pp. 221-225 ◽  
Author(s):  
H. Schuhmacher ◽  
R. Hollnagel ◽  
B.R.L. Siebert
Keyword(s):  
Sensitivity Study ◽  
Dose Equivalent ◽  
Ambient Dose Equivalent ◽  
Conversion Coefficients ◽  
Ambient Dose

DEVELOPMENT OF A NEW SECONDARY STANDARD FOR H*(10)

2020 ◽  
Vol 188 (3) ◽  
pp. 378-382
Author(s):  
K Bairlein ◽  
B Behnke ◽  
O Hupe
Keyword(s):  
Ionization Chamber ◽  
Secondary Standard ◽  
Dose Equivalent ◽  
Air Kerma ◽  
Radiation Fields ◽  
Ambient Dose Equivalent ◽  
Conversion Coefficients ◽  
Aluminium Coating ◽  
Pulsed Fields ◽  
Ambient Dose

Abstract A secondary standard for ambient dose equivalent, H*(10), is necessary for the dissemination of the unit Sievert (Sv), but there is no such standard commercially available currently. Furthermore, the measurement of H*(10) instead of calculating H*(10) from air kerma and conversion coefficients is needed for unknown radiation fields. We developed a prototype of a new secondary standard for H*(10) based on a spherical 1 l ionization chamber for air kerma. This chamber was modified with copper wires at the inner surface to adjust the response of the chamber according to H*(10). Additionally, a Makrolon shell and an aluminium coating were added to optimize the response at energies below 50 keV. The prototype fulfils the requirements given in ISO 4037-2 in the energy range from 12 keV to 7 MeV. In combination with an electrometer, it can be used as area dosemeter, suitable for pulsed fields and for low energy radiation.

scholarly journals Characteristics of Simulated Workplace Neutron Standard Fields

2020 ◽  
Vol 30 (1) ◽  
pp. 71
Author(s):  
Le Ngoc Thiem ◽  
Nguyen Ngoc Quynh ◽  
Dang Thi My Linh ◽  
Phan Thi Huong
Keyword(s):  
Standard Uncertainty ◽  
International Standard Organization ◽  
Dose Equivalent ◽  
Bonner Sphere ◽  
Ambient Dose Equivalent ◽  
Conversion Coefficients ◽  
Standard Organization ◽  
Spectrometer System ◽  
Ambient Dose

This paper presents the development of simulated workplace neutron standard fields at the Institute for Nuclear Science and Technology with the 241Am-Be source moderated by polyethylene spheres with diameters of 15 cm and 30 cm. The characterization of the standard fields (in terms of neutron fluence rates and neutron ambient dose equivalent rates) was performed using Bonner sphere spectrometer system together with MAXED and FRUIT unfolding codes. The related quantities such as neutron dose equivalent-averaged energies and fluence-to-ambient dose equivalent conversion coefficients were also determined. The discrepancies of values are satisfied the standard uncertainty criteria as recommended by the International Standard Organization 12789 series. It implies that the simulated workplace neutron standard fields can be applied in the practical works for calibration purposes.

Calculations of Effective Dose and Ambient Dose Equivalent Conversion Coefficients for High Energy Photons

1999 ◽  
Vol 36 (11) ◽  
pp. 977-987 ◽  
Author(s):  
Osamu SATO ◽  
Nobuaki YOSHIZAWA ◽  
Shunji TAKAGI ◽  
Satoshi IWAI ◽  
Takashi UEHARA ◽  
...  
Keyword(s):  
Effective Dose ◽  
High Energy ◽  
Dose Equivalent ◽  
Ambient Dose Equivalent ◽  
Conversion Coefficients ◽  
Ambient Dose
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