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4. Measuring principle
According ICRU Directive applies for dosimetry of beta radiation (within an energy
range of equal or less than 2 MeV as well as of low energy photon radiation ≤ 15 keV)
the measurement unit directional dose equivalent
H ' &
equivalent
.
(
, 0
07
)
For X-ray and gamma radiation exceeding this energy values, the ambient dose
equivalent
and the ambient dose rate equivalent
H
( *
10
)
measuring values. The separate detection of the dose equivalents H*(10) and
H'(0.07;Ω) with the OD-02 is carried out by means of measurements with or without wall
reinforcement cap (5):
Measuring probe without wall reinforcement
cap
Measuring probe with wall reinforcement cap
The respective dose equivalent is indicated in the upper section of the display (see
fig.9).
Fig. 9) Display of the dose equivalents
Beta radiation of up to 2 MeV (Sr/Y-90) is sufficiently shielded by the fitted wall
reinforcement cap, so that in such cases the measuring variables are
Optional OD-02 Hx:
In countries, which have not introduced metrics according ICRU- Directive, the
considered measurement unit of photon equivalent dose / - dose rate is:
The large energy range of dosimeter required the use of wall reinforcement cap in
dependence of radiation type and energy:
Radiation
X-Ray and Gamma
X-Ray and Gamma
X-Ray and Gamma
Beta radiation
Technical description and operating instructions
Survey meter OD-02
Rev 7 from 27 July 2016
Energy
Wall reinforcement cap
6 – 100 keV
20 keV – 15
MeV
> 15 MeV
with additional moderator cap
≥ 160 keV
and the directional dose rate
H
( '
, 0
07
)
H &
represent the essential
( *
10
)
H ' &
Measuring
(
value =
H
( '
H &
Measuring
( *
value =
H
( *
No
Yes
Yes
lateral / 90° to probe
No
, 0
07
)
, 0
07
)
10
)
10
)
H &
/
.
H
( *
10
)
( *
10
)
comment
Radiation direction:
Only qualitatively
11
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