Health, Drinking Water and Radiation Laboratory Branch (CDPH).
GEL is a large quality certified environmental solutions company
that processes and analyzes environmental samples for many other
power plants, Department of Energy sites and industrial manufacturers.
CDPH performs parallel analysis of many of the same
samples that are collected through the REMP.
Fig. 7 shows a map of the region, the various sampling locations
and the geographical locations of DCPP and the Cal Poly Dairy. In
this region, the prevailing winds and storms (during the Spring)
commonly originate from the northwest. Geographically, the
mountain ranges adjacent to DCPP and the Cal Poly Dairy are
aligned at similar angles, thus reducing the effects that topography
might have on the plume that arrived from across the ocean. Later
in this study it will be seen that the coastal mountains had little
effect on the levels of iodine-131 seen in rainwater and vegetation
because of the similar levels found in samples collected in Atascadero,
California which is located in a region beyond the direct
influence of coastal winds.
Initially it was assumed that the presence of iodine-131 in milk
was primarily the result of the consumption of contaminated
vegetation by cows while on pasture. This exposurewas assumed to
be correlated with the iodine-131 detected in REMP vegetation
samples deposited via the airborne-precipitation pathway. During
the time of increased sampling in response to the events occurring
in Japan during March and April of 2011, observations were made
and discussions held with the dairy herd manager that indicated
this was not an accurate assumption. The main issue was that the
herd had no access to pasture with exposed vegetation.
Fig. 8 shows the layout of the Cal Poly Dairy. The dry lot area
marked D on the aerial photo is where the cows are kept while in
production. Twice daily they are brought to the milking facility (C)where they produce between 30.3 and 32.2 L (8e8.5 gallons) of
milk per cow per day. The dairy cow feeding regime consists of four
parts (Table 7) (Silacci, April 2011 October 2013) which are fed
under the shelter of the main barns in area D.
The two grain allotments were not exposed to deposition via the
airborne-precipitation pathway. It was also observed that the alfalfa
hay supply was located under a covered pole-barn structure
(B) and would be exposed to very limited deposition from precipitation,
if at all. However, itwas observed that the silage pile (A)was
left exposed on the end that was being utilized for daily feeding
(Fig. 9). It is therefore assumed in this study that the silage used for
feed was exposed to airborne and precipitation deposition of
iodine-131 at the same general level that was observed in the REMP
vegetation samples.
Upon further inspection of the dairy facility it became apparent
that of the sevenwater troughs that the production cows had access
to, three of the seven were located at the edge of the barn structures
(Fig. 10). In these locations the water troughs were effectively
exposed to rain and roof runoff. Therefore, another assumption that
is made in this study is that 43% of the water that the herd had
access to was exposed to similar levels of rainwater activity as the
REMP rainwater samples that were collected. This assumption is
supported by the timing of the peak activity of the air plume
detected on March 19th, 2011 and the beginning of the largest
precipitation event which spanned from the 19th to the 20th of
March as well as the subsequent rainfall that followed. All water
troughs hold approximately 190 L (50 gallons) and are operated
with float valves. For the purpose of this study, iodine-131 infiltration
in the three exposed water troughs will be considered equal to
the rainwater collected in the paint trays, bringing them within the
range of activity concentrations seen in the REMP samples.
สุขภาพ น้ำดื่ม และสาขาห้องปฏิบัติการรังสี (CDPH)เจมีคุณภาพขนาดใหญ่ที่ได้รับการรับรองบริษัทแก้ไขปัญหาสิ่งแวดล้อมประมวลผล และวิเคราะห์ตัวอย่างสิ่งแวดล้อมในที่อื่น ๆ อีกมากมายพืชพลังงาน พลังงานของอเมริกา และอุตสาหกรรมผลิตCDPH ทำการวิเคราะห์คู่ขนานมากมายเหมือนกันตัวอย่างที่รวบรวมผ่านการ REMPFig. 7 แสดงแผนที่ของภูมิภาค สถานเก็บตัวอย่างต่าง ๆและที่ตั้งทางภูมิศาสตร์ของ DCPP และผลิตภัณฑ์นมโพลี Cal ในภูมิภาคนี้ เป็นลม และพายุ (ในช่วงฤดูใบไม้ผลิ)โดยทั่วไปมาจากตะวันตกเฉียงเหนือ กันทางภูมิศาสตร์ การมีภูเขาติดกับ DCPP และผลิตภัณฑ์นมโพลี Calจัดทำมุมคล้าย ลดผลกระทบที่ถืออาจมีในเบิ้ลพลูมที่มาจากข้ามมหาสมุทร ในภายหลังในการศึกษานี้ ก็จะเห็นได้ว่า ภูเขาชายฝั่งมีน้อยผลกระทบต่อระดับของไอโอดีน-131 ในแบบสายฝนและพืชพรรณเนื่องจากระดับคล้ายที่พบในตัวอย่างที่เก็บไว้ใน Atascaderoแคลิฟอร์เนียซึ่งอยู่ในภูมิภาคเหนือตรงอิทธิพลของลมที่ชายฝั่งเริ่มต้นจะได้สันนิษฐานที่ของไอโอดีน-131 ในนมมีผลการใช้หลักถูกปนเปื้อนสารพืช โดยวัวบนพาสเจอร์ Exposurewas นี้ถือมี correlated กับไอโอดีน-131 ที่พบในพืช REMPตัวอย่างฝากผ่านทางเดินอากาศฝน ในระหว่างการเวลาของการสุ่มตัวอย่างเพิ่มขึ้นในการตอบสนองเหตุการณ์ที่เกิดขึ้นin Japan during March and April of 2011, observations were madeand discussions held with the dairy herd manager that indicatedthis was not an accurate assumption. The main issue was that theherd had no access to pasture with exposed vegetation.Fig. 8 shows the layout of the Cal Poly Dairy. The dry lot areamarked D on the aerial photo is where the cows are kept while inproduction. Twice daily they are brought to the milking facility (C)where they produce between 30.3 and 32.2 L (8e8.5 gallons) ofmilk per cow per day. The dairy cow feeding regime consists of fourparts (Table 7) (Silacci, April 2011 October 2013) which are fedunder the shelter of the main barns in area D.The two grain allotments were not exposed to deposition via theairborne-precipitation pathway. It was also observed that the alfalfahay supply was located under a covered pole-barn structure(B) and would be exposed to very limited deposition from precipitation,if at all. However, itwas observed that the silage pile (A)wasleft exposed on the end that was being utilized for daily feeding(Fig. 9). It is therefore assumed in this study that the silage used forfeed was exposed to airborne and precipitation deposition ofiodine-131 at the same general level that was observed in the REMPvegetation samples.Upon further inspection of the dairy facility it became apparentthat of the sevenwater troughs that the production cows had accessto, three of the seven were located at the edge of the barn structures(Fig. 10). In these locations the water troughs were effectivelyexposed to rain and roof runoff. Therefore, another assumption thatis made in this study is that 43% of the water that the herd hadaccess to was exposed to similar levels of rainwater activity as theREMP rainwater samples that were collected. This assumption issupported by the timing of the peak activity of the air plumedetected on March 19th, 2011 and the beginning of the largestprecipitation event which spanned from the 19th to the 20th ofMarch as well as the subsequent rainfall that followed. All watertroughs hold approximately 190 L (50 gallons) and are operatedwith float valves. For the purpose of this study, iodine-131 infiltrationin the three exposed water troughs will be considered equal tothe rainwater collected in the paint trays, bringing them within therange of activity concentrations seen in the REMP samples.
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