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| Dosimetry of
gamma radiation |
Dosimetry of
neutron radiation |
X-ray kerma |
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| DOSIMETRY
OF GAMMA RADIATION |
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Quantity - air kerma, dose equivalent and their rates.
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Unit - Gy (gray), Sv (sievert), Gy·h-1,
Sv·h-1.
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Tasks
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The main tasks are
realisation and transfer to the user's instruments of the
scale of dosimetry quantities from low dose rates
(background level) througth the medium dose rates
(radiation protection leveles) to the high dose rate
(therapy level). The instrument type tests and personal
certification in dosimetry field is a further activity of
the Laboratory.
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International
comparisons |
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2000 –
2002 : BIPM.RI(I)-K1 key comparison o fair kerma for 60Co
2005-2008 : No. 813 (EUROMET.RI(I)-K1
and EUROMET.RI(I)-K4) key comparison of air kerma and absorbed dose to
water
2005-2006 : COOMET 318 regional key comparison of air
kerma for 60Co
2000 –
2003 : EA IR3 comparison – radiation protection dosemeters
2000 – 2003 : EA IR4 comparison – personal
dose equivalent
2007 : multilateral
intercomparison in radiation protection
(H*(10) a Hp(10))
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Available
metrological services |
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Radiation
protection - photon rays: |
Therapy
level - photon rays: |
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calibration of dosimeters and reference standards,
- calibration of personal dosimeters,
- calibration of users reference fields, |
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calibration of dosimeters and reference standards. |
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| - tests and verification
of dosimeters, personal dosimetry services. |
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Click for details! |
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Methods
of measurement: |
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- calibration
against the calibrated reference photon field is the main
method used. Also the substitution method is available.
The reference beams are produced in accordance with ISO
4037-1 and ISO 4037-2;
- calibration and tests are performed in accordance with
the working procedures of SMU based on ISO and IEC
standards (ISO 4037-3, STN IEC 61017-1, STN IEC 61017-2,
IEC 61526, ISO 14146);
- for determination of absorbed dose in water the
conversion procedure from air kerma based on IAEA TRS 277
code of practice is used. The calibration itself is done
in water phantom. |
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Instruments
in use |
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Radiation
protection range is covered by the set of secondary
standard ionising chambers Two TEMA irradiators with 137Cs
and 60Co radiation sources are used for
generating of calibrated photon fields. 3-D positionings
variation of source to detector distance in wide range
from 0.5 m to 7 m. The PMMA slab phantom is used for
personal dose equivalent Hp(10)
measurement. In the gamma therapy range, the calibrations
are performed in collimated 60Co reference
photon field. The photon field is calibrated against the
primary standard graphite cavity ionising chamber and
Keithley 6517A electrometer. |
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Set of standard ionising chambers |
The irradiation facility
for the radiation protection level for 137Cs
and 60Co photon reference
beams |
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| DOSIMETRY
OF NEUTRON RADIATION |
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Quantity - absorbed dose, absorb dose
rate, dose equivalent and their rates.
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Unit - Gy (gray), Sv (sievert), Gy·h-1,
Sv·h-1.
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Tasks
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Main tasks are realisation
and transfer to the user's instruments of dosimetry quantities of neutron.
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International
comparisons |
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2001: EUROMET/DUNAMET D28
- Comparison of the National Standard of the Neutron Dose
Equivalent.
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Available
metrological services |
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Radiation
protection - neutron: |
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- calibration
of dosimeters and reference standards; |
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| Parameter |
Range |
Expanded
uncertainty (k=2) |
| ambient
dose equivalent |
(1·10-6
÷ 1·10-3) Sv |
14 % |
| ambient
dose equivalent rate |
(1·10-6
÷ 4·10-4) Sv·h-1 |
14 % |
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- calibration
of personal dosimeters; |
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| personal
dose equivalent |
(1·10-6
÷ 1·10-3) Sv |
14 % |
| personal
dose equivalent rate |
(1·10-6
÷ 4·10-4) Sv·h-1 |
14 % |
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- tests and
verification of dosimeters, personal dosimetry services. |
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Methods
of measurement: |
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- neutron reference fields in accordance with
the ISO 8529 standard are generated in a centre of 10 x
10 x 8 m large room by the underground installed set of 241AmBe,
239PuBe and 252Cf radionuclide
neutron sources and the neutron generator by 1011
s-1 output is under the construction. |
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Instruments
in use |
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Neutron dose
equivalent rate standard - consists of tree substandards: |
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Bonner
Spherical Spectrometer
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the set of different volume tissue eqivalent proportional
counters with related electronics;
- the set of paired ionising chambers with electrometer;
- the Bonner sphere spectrometer with the spherical 3He
counter and electronics. |
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Quantity - air kerma, dose equivalent and their rates.
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Unit - Gy (gray), SV (sievert), Gy·h-1,
Sv·h-1.
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Tasks
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The main tasks are
realisation and transfer to the user's
instruments of dosimetry quantities of X-rays of the
following quantities: ISO 4037-1 Narrow spectra, ISO
4037-1 Wide spectra and IEC 61267 RQA. The quality of the
X-ray beams in Mammography diagnostic level is a further
activity of the Laboratory.
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International
comparisons |
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2001: EUROMET 526 -
Calibration of dosimeters used in mammography with
different X-ray qualities.
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Available
metrological services |
Click
for details! |
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| Air kerma and
air kerma rate, ambient dose equivalent and
ambient dose equivalent rate: |
Personal dose
equivalent and personal dose equivalent rate: |
Quality beams
measurement: air kerma and air kerma rate: |
| - calibration of dosimeters and
reference standards. |
- calibration of personal
dosimeters and personal dosimemeter systems. |
- calibration of dosimeters and
reference beams. |
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Instruments
in use |
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Nomex, PTW |
Instrument for quality beams
measurement Norimex, PTW: absorbed dose 300 nGy
÷ 500 mGy; dose rate is 50 nGy·s-1
÷ 5 mGy·s-1; kV range is 50 kV ÷
150 kV; mAs range is 0.5 mAs ÷ 999.9 mAs.
Set of IC: OMH ND 1000; ND 1001; Xradin A4.
Electrometers: DPI2; Keithley 6517A.
X-ray generator: MG324, Philips: continuous, kV
range is 14 kV ÷ 320 kV, current range is 0.05
mA ÷ 22.5 mA; XHF 30R, Creos: pilsed 100 kHz, kV
range is 50 kV ÷ 120 kV, mAs range is max 640
mAs. |
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