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Dose rate measurement range

μSv/h

0.01 

-

 9999

Dose measuring range

Sv

-

 9.99

Flux density measurement 

range of beta particles

cm

-2

*min

-1

10 

-

  999000  

Range of detectable energy

gamma radiation

beta radiation

MeV

0.05 

-

 3

0,1 

-

 3.5

Margin of error for dose rate

%

± 15

Margin of error for beta-particles,

where “Р” is a measured result

%

± (20+1000 /Р)

Measurement time

seconds

1

Connection type

USB (TYPE-C), Bluetooth

Energy source

Lithium polymer battery

Data saves in memory

500

Continuous operation time

hours

100

Temperature range

°F / °C

-4 to +104 / -10 to +40

Unit Size

in / mm

46 x 19 x 8 / 116 x 48 x 19

Weight

oz / gr

2.8 / 80

The technical specifications and/or any features of this device are 

subject to change by the manufacturer without notice.

!

The on-screen images (icons) shown in this manual may differ 

from the actual images on the screen.

!

How dangerous?

Different levels of ionizing radiation present different degrees of 

danger or they may be just a natural background radiation (coming 

mostly from soil and space). As a general rule, an increase in mea-

surement by 0.2 μSv/h above the established natural background 

radiation is considered an excess or “elevated”. You should be 

aware of where these readings are coming from.

What is on the screen

Notifications and Alarms

audio alarm is ON

battery power at 100%

vibration alarm is ON

battery power at 80%

Bluetooth is ON

battery power at 50%

connected to phone

Bbattery power at 30%

11:45

current time

battery power at 10%

connected to PC

USB connected

saving to History 

Modes of measuring

SEARCH Mode. The sum measurement of dose rate of 

gamma radiation and the flux density of beta-particles, with 

results shown as a graph.

MEASURE Mode. Separate measurement of gamma 

radiation dose and flux density of beta particles.
EDR Mode in white means the detected radiation levels are 

normal. The sum measurement of the dose rate of gamma 

radiation and the flux density of beta particles.

  EDR Mode showing in yellow indicates the detected radiation 

levels as elevated and are higher then threshold Gamma 1 

  

EDR Mode flashing in red means the detected radiation 

levels are dangerous and are higher then threshold Gamma 2

  DOSE Mode is ON for User 1

  DOSE Mode is ON for User 2
  DOSE Mode is ON for User 1 blinking in red means the Dose 

Threshold for User 1 has been reached. 

  DOSE Mode is ON for User 2 blinking in red means the Dose 

Threshold for User 2 has been reached. 

  Settings menu

www.QUARTARAD.com

INCLUDED IN THE PACKAGE

• 

RADEX OBSIDIAN Radiation Dosimeter device

•  USB-C cable

•  User manual

•  Warranty replacement

TECHNICAL SPECIFICATIONS

10

0.12

Margin of Error

Descriptive estimation 

Analog scale

Measurement result

Unit of measurement

10

0.12

11:45

Measured results

Modes of measuring

Notifications and Alarms

Measurement result 

is a numerical value of level of radioactivity

.

Descriptive Estimation

 has 3 phases:

 “Normal Bgnd.” / «Elevated 

Bgnd.” / “Dangerous Bgnd.” (Bgnd. is short for Background).

Analog Scale

 displays the level of radioactivity on a logarithmic scale

Unit of measurement

 displays the units of measurement selected in 

the Settings: 

μSv/h, μR/h, CPS, CPM or their multiples mSv/h, mR/h, 

R/h, KCPS, KCPM.

Margin of Error

 - if set to “Relative” (under Settings) then the margin 

error is displayed as a percent of the nominal value. If set to “Absolute” 

then the margin of error is displayed in the same units as the 

measurement. If set to “Do not show” then the margin of error will not 

be displayed on the screen.

Measured results

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