Wednesday, November 26, 2014
Presented at STSS2010
Natural Radioactivity Measurement And assessment of
exposure in Tourism Beach Sands of Southern Peninsular Malaysia
Ahmad Saat1*, Zaini Hamzah2,
Hamimmah Jamaluddin2
1Instutute of Science
2Faculty of Applied Sciences
Universiti Teknologi MARA
40450 Shah Alam,
Malaysia
*Corresponding author: ahmad183@salam.uitm.edu.my
ABSTRACT
The distribution of gamma-ray activity
concentration and their respective annual effective dose rate from
radionuclides 40K, 226Ra and 232Th for sand
samples collected from eight tourism beaches in Southern Peninsular Malaysia
were determined. The gamma-ray activity was measured by using gamma-ray
spectrometry method. The study found that the mean
activity concentration of 226Ra varies between 7.33 to 51.04 Bqkg-1,
232Th between 5.86 and 37.50 Bqkg-1 while 40K between
32.70 and 146.4 Bqkg-1 respectively. The corresponding annual
effective dose from these natural radiations ranged between 0.051 and 0.301
mSv/y. This average is way below the average worldwide exposure of 2.4 mSv/y.
The external radiation hazard index calculated for the eight samples ranged
between 0.05 and 0.30.
Keywords:
Gamma-rays, annual effective dose, hazard index.
Tahukah Anda 8
Gas radon dalam kawasan kediaman diberikan had "Aras Tindakan" (Action level) sebanyak 148 Bq/m3. Sekiranya melebihi had ini sesuatu tindakan perlu diambil bagi menurunkan kepekatan gas radon dalam ruang berkenaan.
Monday, February 11, 2013
Radionuclides in Beach Sands
The project involved studies on beach sands collected from tourism beaches in Peninsular Malaysia. Activity concentrations of uranium, thorium and potassium-40 were carried out. From the concentrations assessment on external radiation hazard was done. Results indicated that all samples studied shows external radiation index of less than 1 (one). Below are breathtaking views of sun set at Batu 9 Beach, Port Dickson, Malaysia.
Coastal Stress
Our new project/study on coastal stress at Sungai Langat Estuary, Selangor Malaysia. Some photos of the study area. Nuclear techniques applied for sedimentation rate and heavy metals distribution and deposition studies.
a) A small fishing jetty.
b) Mangrove covered coastline from a distance.
c) Mangrove roots network system.
d) Closer view of the coastline covered with mangrove
Wednesday, December 19, 2012
IAC2012, Shah Alam
INDOOR
AND OUTDOOR RADON-222 CONCENTRATION AT VARIOUS LOCATIONS IN PENINSULAR MALAYSIA[1]
Ahmad Saat1,
Zaini Hamzah2
1INTEC
Education College
Universiti
Teknologi MARA
Kampus Seksyen 17
40200 SHAH ALAM.
2Faculty
of Applied Sciences
Universiti
Teknologi MARA
40450 SHAH ALAM.
e-mail:
ahmad183@salam.uitm.edu.my
ABSTRACT
Radon
is the only radionuclide that naturally in gaseous form at room temperature.
Being a gas it has greater mobility, and able to pass through small openings
and blended together with atmospheric air. The main sources of radon are
uranium and thorium that decay through chains that contained radon. Radon
decays by alpha particle emission into a number of progenies before reaching
stability. These progenies also decay by high energy alpha particles emissions.
Radon when inhaled is considered as carcinogenic, and has been blamed as the
second most important causes of lung cancer, after smoking. In Malaysia study
and information on radon are considered as something “new” to the public. The present
study determines the indoor and outdoor radon-222 concentration at various
representative locations in Peninsular Malaysia, by using continuous radon
monitor as well as CR-39 solid state nuclear track detector (SSNTD). The
locations include major cities, towns, tin mining areas, National Park,
residential complex, university campus and new township. Results of the study
showed that the indoor concentrations at the majority of locations are below
the USEPA Action Limit of 148 Becquerel per cubic meter. However in some
locations like former tin mining areas the limit is surpassed. The outdoor
radon-222 concentration depends very much on the geological formations of the
area. Some studied locations were found to have outdoor concentration of higher
than the world’s outdoor average of 14.8 Becquerel per cubic meter. Mitigation
steps are recommended for houses having concentration higher than the Action
Limit.
Keywords:
radon measurements, SSNTD, radon mitigation
RAFF2011 Yasmin
Depth Profile of 137Cs
Fallout in Soil in Cameron Highlands
Zaini Hamzah1, Che Yasmin Amirudin1* and Ahmad Saat2
1Faculty of Applied Sciences, Universiti
Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
2International Education College, Universiti
Teknologi MARA, 40200 Shah Alam, Selangor, Malaysia
|
ABSTRACT
137Cs is one of the important man-made radionuclide introduced into the
environment through nuclear weapons testing and nuclear accidents. In Cameron
Highlands meaningful activity concentration of 137Cs radionuclide
has been measured. The present study embarked on the determination of 137Cs
activity concentration in soils of the sloping area. This would enable the
distribution profile in the soil be investigated. Soil profile samples were collected
by using scrapper plate in the sloping area which covers top, centre and
bottom of the hills and a core in the forest for comparison purpose. The
scrapper is 40 cm long and able to obtain slice of 2 cm interval of soil with
diameter of 15.2 cm. Soil samples were oven dried, ground, sieved, homogenize
and seal properly into a plastic container. The 137Cs activity
concentration was measured by using low background coaxial hyper pure
germanium detector gamma spectrometer based on 137Cs 661.66 KeV
gamma ray. Results showed there were trend of low activity on the top of the
hill and subsequently increases downhill.
In all location, two trends of profiles were observed starting from
the depth of 0 cm to 18 cm and 18 cm
to 30 cm which indicating the presence of two sources of 137Cs.
The 137Cs activity concentrations range detected at top location
was from 0.05 Bq/kg to 1.53 Bq/kg, centre was 0.22 Bq/kg to 2.11 Bq/kg,
bottom was from 0.00 Bq/kg to 2.03 Bg/kg and forest was 0.00 Bq/kg to 0.96
Bq/kg. The basic parameters of the
soil such as pH (top; 3.72, centre; 4.26, bottom; 4.02), density (top; 1.45
g/m3, centre; 1.41 g/m3 , bottom; 1.59 g/m3
) and organic matter content (top; 17.08 %, centre; 16.75 %, bottom; 20.32 %)
also being tested. These
results show that the relative activity concentration of 137Cs at
the top is lowest, while at the bottom is highest, representing the presence of downward transport. However, identical
pattern of profiles were observed at the three points of the slopes.
| Depth Profile | 137Cs method | Gamma Spectrometer | Cameron
Highlands |
® 2010 Ibnu
Sina Institute. All rights reserved.
|
Tahukah Anda (7)?
Terdapat lebih 40 buah telaga air panas di Semenanjung Malaysia. Hanya satu terdapat di Terengganu, Air Panas La.
Radiation Assessment at Gunung Ledang, Malaysia
IN-SITU NUCLEAR RADIATION DOSE ASSESSMENT AROUND TAMAN HUTAN LEGENDA
RESORT AND ALONG TRAILS OF GUNUNG LEDANG, JOHOR
Ahmad Saat1,2,
Zaini Hamzah2, Ab Khalek Wood2
1Institute of Science
2Faculty of Applied Sciences
Universiti Teknologi
MARA
40450 Shah Alam.
Abstract
Being a State Nature Park, areas
within the Gunung Ledang precinct can be considered as undisturbed. No such
data on nuclear radiation of the area was documented previously, hence this
study was carried out as preliminary effort to gather base line data to assess
external radiation dose. Areas around Taman Hutan Legenda Resort and along
adventure trails (Laluan Batu Kapal and Trail Lagenda) are commonly visited by
tourists, hence it is of anthropogenical importance for such study to be carried
out. Radiation dose was measured in-situ at selected points by using portable
radiation surveymeter. Around the low-lying resort area measurement points were
determined based on loose gridding procedures, while along the higher altitudes
trails measurements were at 0.5 km interval. At each points radiation dose was
measured at the ground surface and at 1.0 m from the surface. Results showed
that around the resort the radiation dose ranged from 0.269 to 0.442 mSv/h on the
surface, and from 0.211 to 0.409 mSv/h at 1.0 m from surface. The corresponding
dose along the trails ranged
from 0.160 to 0.317 mSv/h and 0.147 to 0.270 mSv/h respectively. The
study found that relatively the radiation dose around the resort area is higher
than along the trails. However, on average these doses were comparable to that
at Taman Negara, Pahang (0.126 – 0.332 mSv/h) which was studied
earlier.
Keywords: Radiation dose, undisturbed area.
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