ECOTEST DKG-21 User manual

DKG-21
PERSONAL GAMMA RADIATION DOSIMETER
Operating manual
ВІСТ.412118.031-02.02 НЕ

1
CONTENTS
1 GENERAL GUIDELINES .....................................................................3
2 MAIN INFORMATION ABOUT THE DOSIMETER..........................4
3 DESCRIPTION AND OPERATION .....................................................5
4 PROPER USE OF THE DOSIMETER ................................................27
5 TECHNICAL MAINTENANCE..........................................................51
6 STORAGE............................................................................................67
7 SHIPPING ............................................................................................67
8 DISPOSAL ...........................................................................................69
9 WARRANTY .......................................................................................70
10 PACKING CERTIFICATE ................................................................72
11 CERTIFICATE OF ACCEPTANCE..................................................73
12 PERFORMANCE RECORDS OF THE DEVICE .............................74

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13 CLAIMS .............................................................................................75
14 ACCEPTANCE AND WARRANTY.................................................76
APPENDIX А..........................................................................................77
APPENDIX B..........................................................................................79
APPENDIX C..........................................................................................82
APPENDIX D..........................................................................................83
APPENDIX Е ..........................................................................................84
APPENDIX F ..........................................................................................85
APPENDIX G..........................................................................................86
APPENDIX H..........................................................................................90
APPENDIX I ...........................................................................................92
LIST OF ABBREVIAITONS .................................................................93

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This operating manual of ВІСТ.412118.031-02.02 НЕ type contains all
information necessary for studying, proper use of DKG-21 dosimeter of
gamma radiation (hereinafter called the dosimeter) and full realization of
its technical possibilities.
Before operating the dosimeter, the user should be instructed on safety
regulations and radiation safety, and should study this operating manual.
1 GENERAL GUIDELINES
1.1 Carefully study the operating manual (hereinafter called the OM)
before using the dosimeter.
1.2 The OM should always be kept with the dosimeter.
1.3 All records in the OM should be accurate and clear. Notes made in
pencil, erasures and uncertified corrections are not allowed.
1.4 When the dosimeter is handed over to another company, summary
records on operation shall be certified with a seal of the company, which
hands over the dosimeter.

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2 MAIN INFORMATION ABOUT THE DOSIMETER
The dosimeter meets the requirements of ТУ У 33.2-22362867-
010:2007 technical specifications, and is registered in the State Register for
Measuring Instruments, accepted for application in Ukraine. The State
Register No. У2514-07.
The dosimeter is intended for use both independently and as a part of
the automated system of personal dosimetry control (hereinafter ASPDC)
included in the State Register for Measuring Instruments, accepted for
application in Ukraine under No. У1816-07.
2.3 The dosimeter contains no precious materials.
Manufacturer:
Private Enterprise “SPPE “Sparing-Vist Center”
33 Volodymyra Velykoho Str., Lviv 79026, Ukraine.
tel.: [phone]; fax: [phone].
E-mail: sales@ ecotest.ua.

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3 DESCRIPTION AND OPERATION
3.1 Purpose of use
3.1.1 The dosimeter is designed to measure individual dose equivalent
)10(
p
H
ofgammaandX-rayradiation(hereinafter–DE)andindividualdose
equivalent rate
)10(
p
H

(hereinafter –DER) of gamma and X-ray radiation.
3.1.2 The dosimeter can be used at industrial enterprises and companies
that deal with gamma and X-ray radiation sources.
3.2 Technical specifications
3.2.1 DER measurement range varies from 0.1 µSv/h to 1.0 Sv/h.
3.2.2 Main relative permissible error limit of DER measurement at 0.95
confidence probability is:
- 20 % - in the DER range of 1.0 to 10 μSv/h (included);
- 15 % - in the DER range of 10 μSv/h to 1.0 Sv/h.

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3.2.3 Measurement range of DE in the DER range of 0.1 µSv/h to
1.0 Sv/h varies from 0.001 to 9999 mSv.
3.2.4 Main relative permissible error limit of DE measurement in the
DER range of 1.0 µSv/h to 1.0 Sv/h in the DE range of 0.01 to 9999 mSv
at 0.95 confidence probability is 15 %.
3.2.5 Complementary relative permissible error limit of gamma
radiation DER and DE measurement caused by ambient temperature
change from - 20 0С to + 50 0С is 5 % per each 10 0С of deviation from
+ 20 0С.
3.2.6 Energyrangeof registered gamma radiation is from0.05 to 6.0 MeV.
3.2.7 Energy dependence of gamma radiation DER and DE
measurement in the energy range of 0.05 to 1.25 MeV relative to
0.662 MeV energy is not more than ± 25 %.
3.2.8 Anisotropy at gamma quantum incidence at solid angle of ± 600
relative to the main measurement direction (perpendicular to the front panel
of the dosimeter), not more than:
- 25 % - for 137Cs and 60Co radionuclides;
- 85 % - for 241Amradionuclide.

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3.2.9 Time of operating mode setting at DER measurement, not more
than:
- from 1∙10-6 Sv/h to 5∙10-6 Sv/h (inclusive), maximum 30 minutes;
- from 5∙10-6 Sv/h to 2∙10-5 Sv/h (inclusive), maximum 5 minutes;
- from 2∙10-5 Sv/h to 1.0 Sv/h, maximum 3 min.
3.2.10 Time of DER measurement, not more than:
- 10 s –in the DER range of 1.0 μSv/h to 10.0 μSv/h;
- 5 s –in the DER range of 10.0 μSv/h to 1.0 Sv/h.
3.2.11 Minimum DE measurement time expressed in seconds should
not exceed the value calculated by the formula:
, (1.1)
where
)10(
p
H

- a numeric value of DER in µSv/h.
)10(
7200
p
H
t =

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3.2.11.1 The minimum time of DE measurement expressed in seconds,
when the main relative permissible error limit of measurement complies
with the requirements of 3.2.4, does not exceed the value, calculated by the
formula:
, (1.2)
where
)10(
p
H

- is a numeric value of DER in µSv/h.
3.2.12 Continuous operation time when powered from freshly charged
storage battery under normal background is at least 3000 hours.
3.2.13 Unstable readings during 8 hours of continuous operation, not
more than 5 %.
3.2.14 The dosimeter is powered from Li-ion storage battery of 3.2 to
4.2 V voltage and a rated capacity of 120 mAh.
Note. Operating DC supply voltage - 3.7 V.







+= )10(
36000
60
p
H
t

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3.2.15 Dimensions, not more than:
- length - 90 mm;
- height - 55 mm;
- width - 10 mm.
3.2.16 Weight, not more than 0.08 kg.
3.2.17 The dosimeter performs measurements under the following
conditions:
- temperature –from - 20 to + 50 0С;
- relative humidity –(95±3) % at + 35 0С temperature;
- atmospheric pressure –from 84 to 106.7 kPa.
3.2.18 The dosimeter is resistant to sinusoidal vibrations by group N1 in
compliance with recommendations of GOST 12997-84 standard with 10 to
55 Hz frequency, frequency bias 0.15 mm lower than the crossover
frequency.

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3.2.19 The dosimeter is resistant to shocks according to
recommendations of GOST 12997-84 with the following parameters:
- shock pulse duration –9.5 ms;
- number of shocks - 1000±10;
- maximum shock acceleration - 100 m/s2.
3.2.20 The dosimeter in shipping container endures:
- ambient air temperature –from - 30 to + 50 0С;
- relative humidity –(95±3) % at + 35 0С temperature;
- shocks with acceleration of 98 m/s2, shock pulse duration of 16 ms
(number of shocks - 1000±10 in each direction) or equivalent shake tests.
3.2.21 The dosimeter remains unaffected by constant and alternating
magnetic field of (50±1) Hz frequency and 400 A/m intensity.
3.2.22 The dosimeter is immune to gamma and X-ray radiation with
10 Sv/h DER for 50 minutes.

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3.2.23 The dosimeter features “Clock” and “Alarm clock” operating
modes.
3.2.23.1 The alarm clock rings during one minute or until a button is
pressed.
3.2.24 The dosimeter has a threshold alarm system with two
independent threshold levels:
- DER;
- DE.
3.2.24.1 The values of DER threshold levels are programmed within the
range from 0 to 999 999 μSv/h with a discreteness of 0.01 μSv/h.
3.2.24.2 The values of DE threshold levels are programmed within the
range from 0 to 9999 mSv with a discreteness of 0.001 mSv.
3.2.24.3 The programmed values of threshold levels are saved in the
nonvolatile memory of the dosimeter and are not changed when the
dosimeter is switched on/off or the storage battery is replaced.

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3.2.25 The dosimeter sends audio and light signals if the programmed
DER or DE threshold level is exceeded.
3.2.25.1 The dosimeter sends an interrupted audio signal when 90 % of
the programmed threshold level of DE is reached. Press any button to
switch this audio signaling off.
3.2.26 DER and DE values as well as DER and DE threshold level
values alternately appear on the digital liquid crystal display (dLCD).
3.2.26.1 The dosimeter displays the statistical error of DER
measurement result. Indication is performed by a blinking or steady
decimal point in the DER measurement mode.
3.2.27 The dosimeter provides an option to charge the storage battery
from an external charger.
3.2.27.1 The dosimeter displays the process of charging the storage
battery and its completion. Two-color LED is used for indication.
3.2.27.2 Low battery is charged within not more than 5 hours.

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3.2.28 The dosimeter constantly monitors and displays the storage
battery discharge level on the dLCD. It is displayed with the help of the
battery symbol.
3.2.29 The dosimeter ensures self-testing of the dLCD and the
loudspeaker, which is done when the dosimeter is switched on.
3.2.30 The dosimeter records and displays on the dLCD a sign of DER
outranging the upper limit of the measurement range during the device
operation.
3.2.31 Design of the dosimeter provides for its deactivation.
3.2.32 Reliability requirements
3.2.32.1 Mean time to failure, not less than 6000 h. Failure criterion is
nonconformity to the requirements stated in 3.2.2.
3.2.32.2 Average value of operational readiness, not less than 0.999.
3.2.32.3 Mean time to repair, not less than 10000 h, and average service
life (with the storage battery replacement) - not less than 10 years.

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Limit state criterion is deviation of parameters from the values stated in
3.2.2 that cannot be eliminated.
3.2.32.4 Average shelf life (with the storage battery replacement) - not
less than 10 years.
3.2.33 Service capabilities of the dosimeter being functionally compatible
with the personal computer (the PC) with the installed ASIDC SW.
3.2.33.1 The dosimeter supports recording the history of dose
accumulation during a working shift (8 h) in the nonvolatile memory.
Recording is done with reference to real time. The recording interval is
programmed in the range of 5 to 255 minutes with one min discreteness.
3.2.33.2 The dosimeter is able to transfer the history of dose
accumulation to the ASIDC SW on the PC via the infrared port. The
distance of positive exchange between the dosimeter and the infrared port
adapter (IRPA) is not more than 0.3 m.

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3.2.33.3 Coupled with the ASIDC SW, the dosimeter enables:
- blocking the option to turn the dosimeter off until its accumulated data
is read;
- blocking the modes of indication (DER, DER threshold, DE, DE
threshold, clock and alarm clock); change (DER threshold, DE threshold)
and adjustment of clock and alarm clock settings.
3.2.33.4 The dosimeter features an option to record a sign of DER
outranging the upper limit of the measurement range during device
operation in the non-volatile memory and send it to the ASIDC SW.

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3.3 Delivery kit of the dosimeter
3.3.1 The delivery kit is presented in Table 3.1.
Table 3.1 –Delivery kit of the DKG-21 dosimeter
Item
Type
Quantity
Personal gamma radia-
tion dosimeter DKG-21
ВІСТ.412118.030-02.02
1
Storage battery**
LIR2450 (EEMB Battery)
1
Charging device *
Model is not specified
Supplied at a separate order
Operating manual
ВІСТ.412118.031-02.02 НЕ
1
Case
Model is not specified
1
Carton box
ВІСТ.321342.014
1
USB/IrDA adapter
ВІСТ.468353.014-01
Supplied at a separate order
Software on a laser CD
Supplied at a separate order
* micro USB, 5V, 0.5А
** Storage batteries of other manufacturers are allowed provided that they are not
inferior to the specified characteristics and ensure safety, quality and reliability

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3.4 Design and principle of operation
3.4.1 General information
The dosimeter is presented as a mono block including a built-in detector
of gamma and X-ray radiation, a printed circuit board equipped with a
circuit of anode voltage formation, digital processing, control and
indication, an infrared port of data exchange, and a Li-Ion battery.
Gamma and X-ray radiation detector transforms radiation into the
sequence of voltage pulses; the number of pulses is proportional to the
registered radiation intensity.
The circuit of anode voltage formation, digital processing, control and
indication features:
- scaling and linearization of the counting response of the detector;
- measurement of DER through measurement of the average pulse
frequency from the detector output;
- measurement of DE through measurement of the total number of
pulses from the detector output;

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- measurement of real time;
- formation and stabilization of the anode voltage of the detector;
- formation of supply voltage and control of the storage battery charging
process;
- control of operating modes of the dosimeter;
- indication of measurement results.
Power for operation is supplied by a disk-shaped lithium-ion battery of
LIR2450 type (EEMB Battery).
3.4.2 Design description
The dosimeter is designed as a flat square plastic body (Figure B.1,
B.2), which consists of an upper (1) and a lower (2) covers, a battery
compartment lid (3), a film front panel (4) and a metal ring (5) used to
fasten a strap.