scholarly journals Measurement and research of environmental natural radiation dose

2020 ◽  
Vol 191 ◽  
pp. 03005
Author(s):  
Zongxi Wan
Keyword(s):  
Radiation Dose ◽  
Dose Rate ◽  
Absorbed Dose ◽  
Threshold Level ◽  
Living Environment ◽  
Human Beings ◽  
Absorbed Dose Rate ◽  
Natural Radiation ◽  
Radiation Dose Rate ◽  
Radiation Level

The living environment of human beings is being affected by various types of radiation. Among them, natural radiation has the largest dose. If the dose of natural radiation exceeds a certain threshold level, people will face health risks on multiple fronts. In this work, researchers measured the air-absorbed dose rate at 1 meter above different surface environments on campus and estimated the effective dose equivalent of environmental gamma radiation to the residents. Experiments and analyses show that the radiation level on campus was evaluated based on the measurements. The order of the amount of the radiation dose rate is granite pavement > cement pavement > asphalt ground. According to the experiments, the radiation content of external exposure in the campus is already slightly higher than the limit, i.e. 1mSv/y.

DOSIMETRY WITH THE ABILITY TO DISTINGUISH PULSED AND NON-PULSED DOSE CONTRIBUTIONS

2020 ◽  
Vol 190 (4) ◽  
pp. 437-445
Author(s):  
Krystsina Makarevich ◽  
Roland Beyer ◽  
Jürgen Henniger ◽  
Yuzhen Ma ◽  
Sarah Polter ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Dose Rate ◽  
Absorbed Dose ◽  
Digital Signal ◽  
Field Measurements ◽  
Time Structure ◽  
Absorbed Dose Rate ◽  
Radiation Dose Rate ◽  
Pile Up ◽  
Dosimetry System

Abstract The concept of an active dosimetry system for pulsed radiation dose rate measurements is presented. Real-time distinction of pulsed and non-pulsed radiation contributions is based on the time structure of a single interaction. A fast tissue equivalent plastic scintillator is exploited to minimize the pile-up effect influence on absorbed energy measurements. Being connected to a fully digital signal processing board, the detector creates an active dosimetry system with adjustable parameters. With this system, absorbed dose rate measurements were carried out in a photon field with a time structure mimicking a radiotherapeutic beam, but also in the presence of a constant radiation field. Measurements show a linear dependence of a pulsed radiation contribution on the accelerator current in the investigated range of the total dose rate up to 8 μGy h−1. While increasing the accelerator current by 1 μA, the pulsed radiation dose rate grows by (26.2 ± 0.9) nGy h−1 when considering pile-up events.

scholarly journals High Terrestrial Radiation Level in an Active Tin-Mine at Jos South, Nigeria

2020 ◽  
Vol 24 (3) ◽  
pp. 435-442 ◽  
Author(s):  
M. Atipo ◽  
O. Olarinoye ◽  
B. Awojoyogbe ◽  
M. Kolo
Keyword(s):  
Gamma Radiation ◽  
Dose Rate ◽  
Technological Development ◽  
Absorbed Dose ◽  
Ground Level ◽  
Absorbed Dose Rate ◽  
Lifetime Cancer Risk ◽  
Radiation Level ◽  
Background Gamma Radiation ◽  
The Mean

Mineral mining and milling can be a source of national economic and technological development. However, mining of minerals has been confirmed to disturb the natural distribution of radioisotopes in the soil, air and water bodies in the biota. In an attempt to evaluate the radiological burden resulting from tin mining activities at Rayfield-Du area of Jos, the background gamma-radiation level in the mine was measured via a well calibratedhand-held dosimeter placed at 1 m above ground level. The mean absorbed dose rate, annual effective dose rate and excess lifetime cancer risk for the mine was 0.83 μSvh-1; 1.44 mSv-1 and 0.005 respectively. Generally, dose rates were higher in the mine pits and processing areas as compared to administrative areas of the mine. The mean measured dose rate and calculated dose parameters for the mine were all high when compared to the regulatory limit for public exposure. The potential of developing radiation-induced health defects as a result of high radiation absorbed dose rate by the miners and dwellers around the mine is highly probable.  Keywords: Gamma-radiation; mine; absorbed dose rate; radiation exposure.

scholarly journals Measurement of Terrestrial Gamma Radiation Level and Annual Effective Dose in and Around Nuggihalli-Holenarasipura Schist Belts, Karnataka State, India

2021 ◽  
Vol 8 (S1-Feb) ◽  
pp. 97-103
Author(s):  
Niranjan R S ◽  
Ningappa C ◽  
Nandakumar V ◽  
Harshavardhana C N
Keyword(s):  
Effective Dose ◽  
Dose Rate ◽  
Annual Effective Dose ◽  
Absorbed Dose ◽  
Absorbed Dose Rate ◽  
Radiation Level ◽  
Average Value ◽  
Karnataka State ◽  
Gamma Radiations ◽  
Indoor And Outdoor

All individual living beings on the earth are exposed continuously to the radiations coming from terrestrial and extraterrestrial sources and also from their own bodies. The indoor and outdoor ambient gamma radiations are measured in and around Nuggihalli- Holenarasipura schist belts of Hassan district in Karnataka state. The measurements are carried out using the environment radiation dosimeter UR 705 which is a portable detector. Absorbed dose rate and annual effective dose rate are estimated by measuring the exposure rate. The total annual effective dose calculated from both indoor and outdoor varies from 0.68 to1.62 mSv.y-1 with an average value of 1.16 mSv.y-1. The calculated indoor and outdoor annual effective doses are found to be higher than the world average.

scholarly journals Study of Workplace Radiation Dose Rate during the Brain Scanning Procedures

1970 ◽  
Vol 17 (1) ◽  
pp. 27-30
Author(s):  
MM Ahasan ◽  
SM Badruddoza ◽  
AK Paul ◽  
SK Dey ◽  
FU Ahmed
Keyword(s):  
Radiation Dose ◽  
Dose Rate ◽  
Gamma Camera ◽  
Background Level ◽  
Post Injection ◽  
Patient Handling ◽  
Radiation Dose Rate ◽  
Radiation Level ◽  
Brain Scan ◽  
The Brain

Radiation dose rate in the gamma camera workplace were measured during brain scanning procedures using a dose of 15-20 mCi99mTc-pertechnetate (99mTcO4-) given intravenously to each patient. The study based on randomly selected 20 patients duly registered for brain scan at Centre for Nuclear Medicine & Ultrasound (CNMU), Rajshahi. Radiation dose rate at the patienthandling place and computer-operating place were measured by a high sensitive portable dose ratemeter and a NaI detector. Brain imaging procedures were usually done two hours post injection. Radiation dose rate at the patient-handling place found to be 20±4μSvhr-1 and the computer-operating place were 2±0.4μSvhr-1. Patient skull surface doses were measured also and found to be 120±24μSvhr-1 (one hour post injection) and 80±13μSvhr-1 (two hours post injection). The results showed that the radiation dose rate in the gamma camera workplace during brain scanning procedures found to be nearly 6 to 60 times higher than the background level. The research goals of the study were to measure the workplace radiation level during brain scanning procedures and sketched some special remedial measures to reduce the radiation exposure rate in the gamma camera work environment. doi: 10.3329/taj.v17i1.3486 TAJ 2004; 17(1) : 27-30

scholarly journals Active Dosimetry with the Ability to Distinguish Pulsed and Non-Pulsed Dose Rate Contributions

2021 ◽  
Vol 253 ◽  
pp. 09001
Author(s):  
Krystsina Makarevich ◽  
Roland Beyer ◽  
Jürgen Henniger ◽  
Yuzhen Ma ◽  
Sarah Polter ◽  
...  
Keyword(s):  
Dose Rate ◽  
Absorbed Dose ◽  
Digital Signal ◽  
Time Structure ◽  
Absorbed Dose Rate ◽  
Radiation Dose Rate ◽  
Tissue Equivalent ◽  
Dosimetry System ◽  
Pulsed Dose Rate ◽  
Energy Weighting

This paper presents the concept of an active dosimetry system and its operational regime for pulsed radiation dose rate measurements. The plastic scintillator is suggested to be used for absorbed dose rate measurements. As long as the detector can be considered tissue equivalent, the energy weighting of pile-up events in terms of the dose is achieved. The real-time distinction of pulsed and non-pulsed dose rate contributions is based on the time structure of a single interaction and requires only basic information about the beam time structure (pulses duration and period). The detector connected to a fully digital signal processing board creates an active dosimetry system with adjustable parameters. Such a system was used for absorbed dose rate measurements in pulsed photon field mimicking radiation field outside the bunker of a medical LINAC, but also in the presence of a constant radiation component. The results show a linear dependence of a pulsed radiation contribution on the accelerator current in the investigated range of the total dose rate up to 8 μGy/h.

scholarly journals Radiological assessment of the surface soil of Bangladesh

2014 ◽  
Vol 29 (1) ◽  
pp. 67-78 ◽  
Author(s):  
Shyamal Chakraborty
Keyword(s):  
Radiation Dose ◽  
Dose Rate ◽  
Surface Soil ◽  
Specific Activity ◽  
Natural Radionuclides ◽  
Hazard Index ◽  
Sample Collection ◽  
Absorbed Dose Rate ◽  
Radiation Dose Rate ◽  
Entire Area

The specific activities of 232Th, 238U, 40K, and 137Cs in undisturbed surface soil at 56 locations of Bangladesh, covering its entire area, were measured using high resolution HPGe detector. The mean specific activity concentrations of the mentioned radionuclides were respectively found to be 83.56 ? 17.96 Bq/kg, 44.35 ? 12.65 Bq/kg, 630.89 ? 173.85 Bq/kg, and 5.37 ? ? 4.87 Bq/kg. A good correlation between the activities of 232Th and 238U was found. The radiological parameters namely radium equivalent activity, representative level index, external hazard index, internal hazard index, absorbed dose rate, and effective annual outdoor dose rate due to the natural radionuclides were also calculated. The average values of the mentioned parameters were found to be 212.26 ? 43.93 Bq/kg, 1.55 ? 0.32 Bq/kg, 0.29 ? 0.06, 0.69 ? 0.15, 97.27 ? 20.03 nGy/h, and 119.37 ? 24.58 mSv/y, respectively. The radiation dose levels at the points of sample collection were also measured by a portable radiation dose rate-meter. The average value of the outdoor dose rate was found to be 0.20 ? 0.07 mSv/h ranging from 0.16 ? 0.02 mSv/h to 0.28 ? 0.04 mSv/h. The distributions of natural radionuclides were found to be normal. The concentration levels of different radionuclides were comparable to the corresponding reported values of the soil of different countries.

AIRBORNE RADIOMETRIC MAPPING FOR NATURAL RADIATION ASSESSMENT OVER OKITIPUPA SOUTHEAST BELT OF THE BITUMINOUS SAND FIELD OF NIGERIA

2020 ◽  
Vol 192 (1) ◽  
pp. 97-105
Author(s):  
Ajibola Richard Faruwa ◽  
Wei Qian ◽  
Alaba Tolulope Agbele ◽  
Ayodeji Bodunde Babinisi ◽  
Bolaji Ahmed Yekeen
Keyword(s):  
Dose Rate ◽  
Absorbed Dose ◽  
Health Impact ◽  
Activity Levels ◽  
Absorbed Dose Rate ◽  
Natural Radiation ◽  
Natural Activity ◽  
Background Radiations ◽  
Negative Effect ◽  
Major Factors

Abstract Airborne radiometric data were used for natural radiation assessment with the view to assess its likely environmental and health impact, which is one of the major factors that may pose some dangers to both physical and biological components especially during the exploitation of bitumen and also use the assessment as a baseline study that could be useful in planning appropriate environmental management programs that will reduce the potential negative effect of exploiting the resources on the environment. To determine the radiation source effects of humans, exposure rate, absorbed dose rate and annual effective dose rate were computed. The results obtained over Okitipupa southeast belt bituminous sand field indicate that the average levels of natural background radiations are generally not considered harmful. The natural activity levels were not above average and the does appear to be well within recommended limits and norms for naturally occurring activity.

scholarly journals ASSESSMENT OF RADIATION DOSE LEVEL AT KABBA COLLEGE OF AGRICULTURE, DIVISION OF AGRICULTURAL COLLEGES, AHMADU BELLO UNIVERSITY, ZARIA

2021 ◽  
Vol 5 (1) ◽  
pp. 524-528
Author(s):  
I. A. Bello ◽  
O. O. Ige ◽  
N. Kure ◽  
A. H. Momoh
Keyword(s):  
Radiation Dose ◽  
Effective Dose ◽  
Dose Rate ◽  
Background Radiation ◽  
Annual Effective Dose ◽  
Academic Staff ◽  
College Of Agriculture ◽  
Radiation Dose Rate ◽  
Radiation Level ◽  
Materials Used

Background radiation involves the measure of the level of ionizing radiation present in the environment at a particular location. This research seek to generate data of the natural background radiation level of some selected Sections at Kabba College of Agriculture, using RadEye G20 survey meter. A total of 15 sections of the College were randomly selected and the background radiation dose rate of the sections were measured. The indoor dose rate ranged from (0.09 – 0.13) 𝜇Sv/yr, while the outdoor dose rate ranged from (0.07 - 0.10) 𝜇Sv/yr. The indoor annual effective  dose were observed to be greater than the outdoor annual effective dose in all the College Sections measured. The lowest total annual effective dose 0.75 𝑚𝑆𝑣/𝑦𝑟 was found at the Academic staff block. The highest total annual effective dose of 1.09 𝑚𝑆𝑣/𝑦𝑟 was found at the livestock building, this might be due to the high-altitude nature of the area and the rocky materials used in the construction of the building. The highest total annual effective dose of the study area was slightly above the recommended limit of 1.0 𝑚𝑆𝑣/𝑦𝑟. The result obtained from this research may not constitute immediate health risk to the staff and student of the college

scholarly journals Investigation of Background Radiation Level Within X-ray Machine Environment

2015 ◽  
Vol 6 ◽  
pp. 145-149
Author(s):  
F Gbaorun ◽  
D Terver
Keyword(s):  
Radiation Dose ◽  
Dose Rate ◽  
Background Radiation ◽  
Background Level ◽  
Maximum Level ◽  
Radiation Dose Rate ◽  
Radiation Level ◽  
X Ray ◽  
Dose Rates ◽  
Machine Room

In this study, a Geiger Muller ionization counter has been used to investigate the variation of background radiation dose level with time in a typical x-ray machine room and its environment. This is to monitor the effect of x-ray exposure on the background ionizing radiation level. The results showed that within a period of 3 hours, the cumulative background radiation dose in the x-ray room grew from s s Gy to around 84 . 90 ́ 10 - 10 - an initial level of 38 . 78 ́ Gy compared with nearby rooms where the s cumulative radiation grew from almost zero to a maximum value of about 46 . 9 ́ Gy within the 10 - same period. It was observed that after a radiation exposure from the machine, the background s radiation dose rate took about 25 minutes to decay from a maximum level of around 45 ́ Gy/hr to 10 - - s 17 . 47 ́ 10 the background level about Gy/hr which was found to be higher than the background dose rates in other nearby locations. While the dose rate in the x-ray machine room was higher than the s 10 - maximum dose limit of 12 ́ Gy/hr recommended for members of the public by the International Committee for Radiation Protection (ICRP), the dose rates in the other locations studied in the neighbourhood of the x-ray machine were within the limit.

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