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Nuclear and Radiation Metrology Section Regulatory Technical Support Division

Office of Atoms for Peace

Organization Structure


Development of ionising radiation metrology in Thailand

The national reference laboratories were initiated in 1981 with the support of IAEA and have been continuously developed.

After signing the agreement (MOU) in 2004, OAP has been designated by the National Institute of Metrology of Thailand (NIMT) to be responsible for national measurement standards in the field of ionising radiation and radioactivity.

In 2009, OAP signed the commitment to be a full member of the Asia Pacific Metrology Programme (APMP).

SSDL-OAP received ISO/IEC 17025 accreditation in the scope of survey meter, pocket dosimetry and High-Dose Dosimeter in 2009, 2012 and 2014 respectively.

Ionising Radiation Metrology Building already have got the budget from the cabinet (518 Million Baht) and already constructed in 2015. The Building will be finished by April 2019.

The development and upgrading of Primary Standard Dosimetry/Radioactivity Laboratory for Thailand project has been initiated from 2016-2020 (650 Million Baht).


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MOU between KRISS KONICOF and OAP


Objective The objective of this MoU is to promote cooperation in the field of ionizing radiation metrology between the Participants and provide a framework for cooperation between the Participants on the basis of equality and mutual benefit. This MoU is not intended to be legally binding. Forms of Cooperation Forms of cooperative activities under this MoU may include, but are not limited to: Development of joint research projects Exchange of research scientists and engineers Exchange of scientific and technical information Co-organization of seminars, symposia and conferen

ces Other activities that may be agreed upon by the Partic

ipants

Secondary Standard Dosimetry Laboratory (SSDL)

High-dose Radiation Dosimetry Calibration Laboratory (HDCL)

National Standard Radioactivity Laboratory (NSRL)

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Nuclear and Radiation Metrology Section


• The main responsibilities of SSDL-OAP are to maintain standards in radiation protection level and to provide gamma, x-ray and beta calibration services for radiation users in research, industrial and medical sectors.

• The air kerma rates in the beams produced by the highest activity Cs-137 and Co-60 are approximately 27.90 and 0.212 mGy/h respectively at 1 m from the source (22/11/2017).

• A 160 kV X-ray machine was installed and aimed to characterize the photon beam quality between 30-150 kV.

• A Free Air Chamber for low energy X-ray, medium energy X-ray and Two Graphite Cavity Chamber which assembled by KRISS were installed in 2017 and 2018.

• Optically Stimulated Luminescence (OSL) System for dose evaluation were installed in 2017.

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Secondary Standard Dosimetry Laboratory (SSDL of OAP)


• The HDCL plays the role as the national standard in high-dose radiation Dosimetry which can provide high-dose calibration services to support radiation-processing applications such as food processing, sterilisation of medical products, environmental conservation, and polymeric materials.

• The reference standard system which is traceable to NPL is composed of the FRICKE solution, UV-VIS spectrometer and a gamma irradiator (Gammacell 220 Excell irradiator which has initial activity 23 kCi on 12/09/2003).

• A new electron spin resonance spectrometer (ESR) will be installed in 2019.

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High-dose radiation dosimetry laboratory (HDCL of OAP)


• The NSRL’s main responsibility is maintaining national standards in radioactivity by using 4-π Ionization system as reference standard that can be traceable to NMIJ.

• The NSRL also provides calibration services such as certifying liquid and solid radioactive sources and calibrating all type of contamination monitors and hand & shoes monitors by using many standard large area sources.

• The NSRL is also equipped with an imaging plates system, a liquid scintillation counters (LSC), well-type and planar HPGe with digital gamma spectrometers.

• Additionally, two transferred dose calibrators are available to be compared at any nuclear medicine centres upon requested.

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National standard radioactivity laboratory (NSRL of OAP)


STAFFS


(Radiation Biosciences)

SSDL HDCL NSRL

• Stability test every 3 months for SSDL-OAP

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Activities: Maintain Standards


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Reference standard test every year Proficiency test:

› IAEA TLD Postal Quality Audit for Radiation Protection Calibration for SSDLs in 2013 – Already reported on 01/2014

› APMP Key Comparison for Measurement of Air Kerma for Low-energy X-ray, APMP.RI.(I)-K2

› APMP Key Comparison for Measurement of Absorbed Dose Rate in Tissue for Beta Radiation, APMP.R(I)-S2

› APMP KeyComparison of high-dose dosimetry using alanine dosimeters, APMP.RI(I)

› APMP Key Comparison of Activity of radionuclide I-131, APMP.RI(II)-K2 › APMP key comparison of Radioactivity measurement of Cs-134 and Cs-137 in

Brown rice, APMP.RI(II)-S3 › APMP key comparison of Fe-59 activity measurement, APMP.RI(II)-K2


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Traceability › 2 ionisation chambers have calibrated from NMIJ in 2018. › Use FRICKE as reference standard dosimeter to calibrate

the Gammacell 220excell and assured by alanine dosimeters serviced by NPL. The variation of HDCL from NPL in July 2018 was + 1.5 %.

› The IG11/A20 and IG12/N20 ion chambers in 10 cm cylindrical lead shields with Ho-166m reference sources which are traceable to NMIJ, Japan.


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Activities: Services

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Survey meters Pocket dosimeters OSLs TLDs Reference Materials Contamination Monitors Dose Calibrators Dosimeters

Am

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Survey meters Pocket dosimeters OSLs TLDs Reference Materials

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Activities: Maintain and Transfer Standards

Surveillance Programme from Thai Industrial Standards Institute

(TISI) in Feb 2018 ***No CAR*** Peer Review from Prof. Dr. Chul-Young Yi, KRISS, 21-23 Aug 2018

• Documented a technical management system that is in substantial compliance with ISO/IEC 17025 and has properly implemented it

• Trained technical staff members • Has appropriate equipment to conduct the calibration and

irradiation service with claimed CMC. National Workshop on Ionizing Radiation Metrology

To Strengthen the network of ionizing radiation metrology in

Thailand


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Activities: Maintain and Transfer Standards

11th APEC Policy and Partnership on Science, Technology and Innovation – APEC-PPSTI, 26Feb–1Mar 2018, Port Moresby, Papua New Guinea

“ Building Asia-Pacific Standards Dosimetry Laboratories capabilities toward regional sustainable network”

12th APEC Policy and Partnership on Science, Technology and Innovation – APEC-PPSTI, 12–15 Aug 2018, Port Moresby, Papua New Guinea

“ Building Asia-Pacific Individual Monitoring Service (IMS) capabilities toward regional sustainable network”


Workshop on Quality Audit for Radiation Protection Calibration for Standard Dosimetry Laboratory in South East Asia Region, 19-21 March 2018, Bangkok, Thailand

The comparison of Air Kerma for Cs-137 and Co-60 radiation protection calibrations

Workshop on Quality Control for Radioactivity using dose calibrators, 18 May 2018, Bangkok Thailand

The dose calibrators proficiency testing program in nuclear medicine in Thailand

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Activities: Training the staffs

ISO/IEC 17025:2017

Internal Audit

Risk Management for ISO/IEC 17025:2017

Absolute Measurements of the Air Kerma from the Medium Energy X-ray Beams, and the Calibration Procedures of the relevant dose rate meters, KRISS, Korea


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OSL system FAC x-ray low

energy Graphite Cavity

Chamber


Road Map of Ionizing Radiation Metrology

2017

2018

2019

2020

2021

Primary Standard

Instrument and

Transfer

Dosimeter

System: Free Air Chamber for

Low energy X-ray,

Graphite Cavity

Chamber for Gamma,

Optically Stimulated Luminescence

Dosimeter (OSL)

System

Primary Standard

Instrument and

QC Instrument: Free Air Chamber for Medium energy X-ray,

Monitor Chamber

Network: Standard Dosimetry Laboratory Network

in ASEAN

Intercomparison

Programme: Radiation Protection

Calibration for SDL

Primary Standard

Instrument: Water Calorimeter for

Absorbed Dose

Measurement

Primary Standard

Dosimetry

Laboratory: Gamma Ray Dosimetry

for Radiation Therapy,

X-ray Dosimetry for

Low energy X-ray, High

Energy Photon

Dosimetry from LINAC

Intercomparison

Programme: Individual Monitoring

Service

Primary Standard

Dosimetry


for Radiation Protection,

X-ray Dosimetry for

Medium energy X-ray,

High-Dose Radiaiton

Dosimetry, Beta

Dosimetry

Intercomparison

Programme: Radiation Therapy

Calibration for SDL, Radiation Diagnostic

Calibration for SDL,

Radiation Protection Calibration for SDL

Network: SDL, IMS

Primary Standard

Dosimetry


for environmental Level,

Neutron Dosimetry,

Radioactivity

Intercomparison

Programme: Radiation Therapy


Radiation Diagnostic


Radiation Protection Calibration for SDL,

Neutron Dosimetry

Network: SDL, IMS IONIZING

RADIATION METROLOGY

CENTRE


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Ionising Radiation Metrology Project


Ionising Radiation Metrology Building

External Radiation Dosimetry Reference Standard Laboratory

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21 Office of Atoms for Peace

Ionising Radiation Metrology Building


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2015 2016

2017 2018


Thank you for your attention


Documents

Nuclear and Radiation Metrology Section Regulatory ...ssdl.oap.go.th/ssdlonline2/wp-content/uploads/... · Nuclear and Radiation Metrology Section Office of Atoms for Peace • The