Estimasi Dosis Radiasi 210Po pada Ikan Laut Konsumsi dari Perairan Banda Aceh

The main idea of this study is to calculate 210Po activity in marine biota from Banda Aceh waters and calculate dose estimates for marine biota consumers. Polonium analysis was carried out for Kaka Tua fish, Layur fish, Talang-talang fish, Kawet fish, and sharks using alpha spectrometer. The highest 210Po activity was found in sharks at 16.90 Bq/kg and Kaka tua fish at 16.24 Bq/kg. This activity is slightly above the recommended value for seafood, which is 15 Bq / kg. Based on the calculation, the daily intake for adults is around 0.18-0.41 Bq, for children, it is 0.12-0.27 Bq, and infant are 0.06-0.14 Bq. The daily intake of adults and children exceeds the recommended annual intake limit. However, the annual intake of many countries in the Asian region, including Japan and China, also far exceeds the recommended value. The amount of marine fish consumed significantly influences this annual dose estimate. The estimated dosage of 210Po yearly for adult consumers is 32.3-71.42 µSv/year for children, it ranges from 46.65-103.16 µSv/year, and for infants, it ranges from 78.95-174.58 µSv/year. These values are similar to the UNSCEAR recommended values: around 70, 100, and 180 µSv/year for adults, children, and infants. Ide utama dari penelitian ini adalah untuk menghitung aktivitas 210Po pada biota laut dari perairan Banda Aceh dan menghitung estimasi dosis terhadap konsumen ikan laut. Analisis polonium dilakukan terhadap sampel ikan ikan kaka tua, ikan layur, ikan talang-talang, ikan kawet, dan ikan hiu menggunakan alfa spektrometer. Hasil penelitian menemukan aktivitas 210Po tertinggi pada ikan hiu yaitu 16,90 Bq/kg, dan ikan Kaka tua sebesar 16,24 Bq/kg. Aktivitas ini sedikit diatas nilai yang direkomendasikan untuk makanan laut, yaitu sebesar 15 Bq/kg. Berdasarkan perhitungan, asupan harian terhadap orang dewasa sekitar 0,18–0,41 Bq, untuk anak anak sebesar 0,12–0,27 Bq dan bayi sebesar 0,06-0,14 Bq. Asupan harian dewasa dan anak melebih batas tahunan asupan yang direkomendasikan, namun asupan tahunan dari banyak Negara di kawasan Asia termasuk Jepang dan China juga jauh melebih nilai yang direkomendasikan Jumlah konsumsi ikan laut sangat berpengaruh terhadap estimasi dosis tahunan ini. Penghitungan estimasi dosis 210Po tahunan terhadap konsumen dewasa adalah sebesar 32,3–71,42 µSv/tahun, untuk anak anak berkisar antara 46,65–103,16 µSv/tahun dan untuk bayi berkisar antara 78,95–174,58 µSv/tahun. Nilai ini mirip dengan nilai rekomendasi UNSCEAR, yaitu sekitar 70, 100 dan 180 µSv/tahun untuk dewasa, anak anak dan bayi.

Levels and Distributions of 210Pb and 210Po in Selected Seafood Samples in China and Assessment of Related Dose to Population

In this study, the activity concentrations levels of 210Pb and 210Po in the edible portions of eight seafood samples collected from the Fujian coast of China were determined. The activity concentrations ranged from 0.74 ± 0.08 to 12.6 ± 1.0 Bq/kg for 210Po and from the minimum detectable limit (MDL, 0.80 Bq/kg) to 11. 7 ± 1.1 Bq/kg for 210Pb. The 210Po activity concentration in all the fish organs ranged from 0.68 to 204 Bq/kg (w.w.), and the 210Po activity was mainly concentrated in the stomach, spleen, heart, liver, gonad, and intestine samples. The 210Pb activity concentration in all the fish organs ranged from the MDL to 15.2 Bq/kg (w.w.), and the 210Pb activity was concentrated in the head, fish scale, and gill samples. The annual effective ingestion doses ranged from 82.8 to 255 μSv/a for all age groups, and the lifetime risk of cancers were estimated. Both the effective ingestion doses and cancer risk to humans were within the acceptable ranges.

210PO IN SOIL AND TOBACCO LEAVES IN QUANG XUONG, VIETNAM AND ESTIMATION OF ANNUAL EFFECTIVE DOSE TO SMOKERS

210Po is the main radiotoxic chemical in tobacco smoke and one of the primary causes of lung cancer. Investigating 210Po concentration in tobacco is important in estimating the annual effective dose (AED) due to smoking. In this study, the 210Po concentrations in tobacco leaves and soil in Quang Xuong, Vietnam were measured using a high-resolution passivated and implanted planar silicon detector. Based on these data the AEDs to smokers were estimated. The 210Po activity concentration in tobacco varied significantly from 28.7 to 254.0 mBq g−1, whereas its variation in soil was insignificant. The AED due to smoking fresh tobacco leaves in Vietnam (average 565 μSv y−1) was significantly higher than the values reported for other countries (36–361 μSv y−1).

Retrospective radon measurements based on implanted 210Po in glass objects using polycarbonate detectors

In the present investigation, a surface-deposited polonium was measured in 37 houses in Rasht and Ramsar cities of Iran with the aim of evaluating the retrospective radon concentration. The CR-LR technique is widely used in this regard, but for the first time, Lexan polycarbonate detectors were used to measure the activity of 210Po planted in glassy objects. These detectors were placed on glassy surfaces for 153 to 365 days. A passive cylindrical diffusion chamber was used for the contemporary radon concentration measurements. The diffusion chamber consists of the Lexan polycarbonate films as a solid state nuclear track detectors and filter. The surface-deposited 210Po activity concentration was found to vary from 0.26 to 11.96 mBqcm-2 with average of 2.62 mBqcm-2. The sensitivity of 210Po to polycarbonate was determined to be 0.06456 track per cm2 per mBqhcm-2. Thus, the radon concentration was found to vary from 122 to 4840 Bqm-3 with an average value 1243 Bqm-3 and the contemporary radon concentration in the area was found to vary from 15 to 2420 Bqm-3 with an average 513 Bqm-3. The results indicate that there is a significant correlation between the concentration of the retrospective radon and the concentration of the contemporary radon gas in the indicated areas with a coefficient of 0.80672.

Determination of 210Po content of vietnamese tobacco samples

Smoking is one of the leading causes of preventable death. In recent years, numerous countries have initiated the prohibition of smoking in restaurants, workplaces and public spaces. The Vietnamese government intends to follow the precautions against public smoking as well. Over and above the number of some hazardous chemical components found in tobacco, 210Po isotope content could enhance the probability of the development of lung cancer. In this study 14 Vietnamese tobacco products (commercial cigarettes and pipe tobacco) 210Po activity concentration were determined using PIPS semiconductor alpha spectrometry. The results showed that the 210Po activity concentration of the investigated samples varied between 7.40 ± 1.09–128.64 ± 11.22 mBq g−1. The average 210Po content of commercial cigarettes was 15.5 mBq g−1, whilst the average of pipe tobacco was 20.4 mBq g−1. To estimate the risk of inhalation of 210Po isotopes originating as a result of smoking, dose estimations were carried out.