Bulletin of Engineering Geology and the Environment,
Год журнала:
2024,
Номер
83(7)
Опубликована: Июнь 12, 2024
Abstract
The
numerical
modeling
of
radon
concentrations
in
the
fault
zone
underground
excavations
at
Książ
Castle
was
conducted
using
a
stochastic
Discrete
Fracture
Network
(DFN)
model.
Due
to
difficulties
related
with
obtaining
exact
fractures
rock
mass,
novel
approach
used
this
study
incorporates
model
known
site
data.
analysis
utilized
dataset
comprising
long-term
measurements
222
Rn
activity
concentration
and
geodetic
for
twelve
faults
unit.
parameters
considered
DFN
are:
fracture
length,
Peclet
number
(
Pe
=
0.1
1.0,
respectively),
advection
velocities
(from
10
–8
m/s
–6
from
range
–7
–4
m/s,
diffusion
D
2.1
×
1/s),
decay
constant
λ
gas
generation
q
)
along
within
1.5
–3
Bq/m
3
·s
3.5
·s.
calibration
process
obtained
best
fit
when
rate
uniformly
distributed
through
mass
addition
incorporating
higher
value
3.0
·s)
where
elevated
have
been
measured.
results
also
confirmed
that
should
always
be
were
measured
regardless
measurement
period.
For
indicated
“area”
25%
37.5%
between
May–October
18.5%
40%
November–April.
influence
zones
on
recorded
noticeable
up
depth
15
m.
Within
range,
highest
values
concentration,
ranging
1,600
2,000
,
consistently
observed
season.
However,
as
increased,
decreased
800
400
became
more
dispersed.
Scientific Reports,
Год журнала:
2024,
Номер
14(1)
Опубликована: Янв. 30, 2024
To
ensure
the
safety
and
stability
of
beach
surface
decommissioned
uranium
mill
tailings
pond,
this
paper
uses
red
clay-bentonite
clay
(1:1)
to
carry
out
covering
layer
radon
reduction
simulation
experiments
study
temperature,
humidity,
effect
under
natural
conditions.
The
results
show
that
exhalation
rate
cover
is
only
0.32
times
clay,
which
has
a
better
effect.
water
retention
comparable
heat
preservation
than
layer.
temperature
curves
follow
same
evolution
trend
were
close
together
in
outdoor
conditions,
humidity
showed
difference
1%
3%.
Soil
dominant
factor
affecting
variation
with
unsaturated
content.
Geosciences,
Год журнала:
2025,
Номер
15(1), С. 14 - 14
Опубликована: Янв. 6, 2025
The
study
of
the
influence
geological
structure
(e.g.,
faults)
on
radon
emanations
is
usually
applicable
provided
that
there
are
conditionally
background
(control)
territories
with
which
indicators
will
be
compared.
In
presented
study,
we
selected
an
area
where
pre-Cenozoic
faults
could
potentially
associated
hazard
Kuznetsk
coal
basin
were
not
identified.
cover
deposits
in
represented
by
loamy
and
clayey
strata
overlying
Paleozoic
sedimentary
cycles.
field
was
estimated
based
flux
density
(RFD)
activity
concentration
(RAC)
soil
gas.
RAC
measured
two
ways—by
sorption
method
activated
carbon
active
sampling
gas
from
a
borehole.
At
same
time,
role
meteorological
conditions
physical
properties
assessed.
Our
shows
local
variations
insignificant
do
have
significant
effect
basin,
exception
moisture.
High
values
territory
considered
as
background,
absence
faults,
suggest
other
causes
(the
presence
latest
Neogene–Quaternary
high
concentrations
226Ra,
or
insufficiently
studied
causes).
Due
to
it
possible
assume
diffusion
type
transfer
environment,
indicates
shallow
source
such
concentrations.
results
indicate
studies
226Ra
content
additional
similar
areas
should
also
carried
out.
