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Fig. 6 Decay Correction Factors

 

Section 4

Results

20

Hours

DCF

Hours

DCF

Hours

DCF

Hours

DCF

Hours

DCF

0

1.000

1

1.008

2

1.015

3

1.023

4

1.031

5

1.038

6

1.046

7

1.054

8

1.062

9

1.070

10

1.078

11

1.087

12

1.095

13

1.103

14

1.112

15

1.120

16

1.128

17

1.137

18

1.146

19

1.154

20

1.163

21

1.172

22

1.181

23

1.190

24

1.199

25

1.208

26

1.217

27

1.226

28

1.236

29

1.245

30

1.254

31

1.264

32

1.273

33

1.283

34

1.293

35

1.303

36

1.312

37

1.322

38

1.332

39

1.343

40

1.353

41

1.363

42

1.373

43

1.384

44

1.394

45

1.405

46

1.415

47

1.426

48

1.437

49

1.448

50

1.459

51

1.470

52

1.481

53

1.492

54

1.504

55

1.515

56

1.526

57

1.538

58

1.550

59

1.561

60

1.573

61

1.585

62

1.597

63

1.609

64

1.622

65

1.634

66

1.646

67

1.659

68

1.671

69

1.684

70

1.697

71

1.710

72

1.723

73

1.736

74

1.749

75

1.762

76

1.775

77

1.789

78

1.802

79

1.816

80

1.830

81

1.844

82

1.858

83

1.872

84

1.886

85

1.900

86

1.915

87

1.929

88

1.944

89

1.959

90

1.973

91

1.988

92

2.003

93

2.019

94

2.034

95

2.049

96

2.065

97

2.081

98

2.096

99

2.112

100

2.128

101

2.144

102

2.161

103

2.177

104

2.194

105

2.210

106

2.227

107

2.244

108

2.261

109

2.278

110

2.295

111

2.313

112

2.330

113

2.348

114

2.366

115

2.384

116

2.402

117

2.420

118

2.438

119

2.457

120

2.475

121

2.494

122

2.513

123

2.532

124

2.551

125

2.571

126

2.590

127

2.610

128

2.629

129

2.649

130

2.669

131

2.690

132

2.710

133

2.731

134

2.751

135

2.772

136

2.793

137

2.814

138

2.836

139

2.857

140

2.879

141

2.901

142

2.923

143

2.945

144

2.967

145

2.990

146

3.012

147

3.035

148

3.058

149

3.081

150

3.105

151

3.128

152

3.152

153

3.176

154

3.200

155

3.224

156

3.249

157

3.273

158

3.298

159

3.323

160

3.348

161

3.374

162

3.399

163

3.425

164

3.451

165

3.477

166

3.504

167

3.530

168

3.557

169

3.584

170

3.611

171

3.638

172

3.666

173

3.694

174

3.722

175

3.750

176

3.778

177

3.807

178

3.836

179

3.865

180

3.894

181

3.924

182

3.954

183

3.984

184

4.014

185

4.044

186

4.075

187

4.106

188

4.137

189

4.168

190

4.200

191

4.232

192

4.264

193

4.296

194

4.329

195

4.361

196

4.395

197

4.428

198

4.461

199

4.495

200

4.529

201

4.564

202

4.598

203

4.633

204

4.668

205

4.704

206

4.739

207

4.775

208

4.811

209

4.848

210

4.885

211

4.922

212

4.959

213

4.997

214

5.035

215

5.073

216

5.111

217

5.150

218

5.189

219

5.228

220

5.268

221

5.308

222

5.348

223

5.389

224

5.429

225

5.471

226

5.512

227

5.554

228

5.596

229

5.638

230

5.681

231

5.724

232

5.768

233

5.811

234

5.855

235

5.900

236

5.945

237

5.990

238

6.035

239

6.081

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Содержание RAD H2O

Страница 1: ...RAD H2O Radon in Water Accessory for the RAD7 User Manual...

Страница 2: ...mful chemicals to use Once the procedure becomes familiar and well understood it will produce accurate results with minimal e ort It is assumed that the user has a good working knowledge of the RAD7 I...

Страница 3: ...or assembly 11 1 4 5 Finishing the Test 11 1 4 6 Interpreting the Results 11 Fig 5 RAD H2O printout 12 2 BACKGROUND 13 2 1 About Radon in Water 13 2 2 Health Risks Due to Waterborne Radon 13 2 3 Physi...

Страница 4: ...omparison of RAD H2O with Other Methods 23 5 4 Quality Assurance 23 Fig 7 Method Comparison 24 6 CARE MAINTENANCE and TROUBLESHOOTING 25 6 1 Warning on Pump Direction 25 6 2 Warning on Tipping the Aer...

Страница 5: ...DGE immediately at 978 667 9556 or email sales durridge com Continued on next page Section 1 Getting Started 5 RAD H2O Carrying Case Rugged Pelican brand case Dust proof and crushproof Sculpted foam i...

Страница 6: ...RAD H2O Aerator Cap Kit Aerator Cap x2 Tubing for 40mL and 250mL vials Indoor Faucet Adaptor Plastic adaptor 20 inch vinyl tubing Drying and Charcoal Tube Kit Small drying tubes x 4 Tube of activated...

Страница 7: ...the event that the tube connections to the instrument are reversed For more information on preventing water from entering the RAD7 see Section 6 2 Warning on Tipping the Aeration Unit Section 1 Getti...

Страница 8: ...e tube of desiccant which is connected to the aerator cap and supported by a clamp on the retort stand The components are connected to one another using the included tubing as shown in Fig 3 on the fo...

Страница 9: ...he laboratory drying unit to the RAD7 inlet with the inlet filter in place see RAD7 manual Purge the unit with fresh dry air for ten minutes After 10 minutes of purging with dry air push the Menu butt...

Страница 10: ...ht of the 6th 250mL vial The end of the glass frit should be 150mm or 4 7 16 from the bottom of the aerator cap Adjust it as necessary Pick the tube appropriate to the size of vial containing the wate...

Страница 11: ...ed for the small drying tube Continue the purge for another ten minutes Check the relative humidity as above and continue the purge until the relative humidity indication in the instrument drops to 6...

Страница 12: ...Fig 5 RAD H2O printout Section 1 Getting Started 12...

Страница 13: ...e public exposure to waterborne radon having discovered cases in which groundwater concentration exceeded 1 million pCi L Hess Federal action on the problem of radon in drinking water picked up in the...

Страница 14: ...m Radon is continually being created in the ground so that groundwater often has high radon content By contrast open water contains very little dissolved radium That together with the proximity of the...

Страница 15: ...shielded for high energy radiation and the residents are likely to spend significant periods of time in the radiation field Over time a long lived decay product lead 210 builds up in the column which...

Страница 16: ...l will continue to contain the radon that was measured If this radon is still present when you start a new measurement it will erroneously influence the next measurement This is of special concern whe...

Страница 17: ...ining radon from the system following the purge A small column containing 15 grams of activated carbon can remove up to 98 of the remaining radon from the RAD H2O system when connected in a closed loo...

Страница 18: ...orb a small fraction of the radon that passes through the system A small fraction of a very large amount can still be a significant amount The radon may desorb from these materials over many hours In...

Страница 19: ...exponential function with a time constant of 132 4 hours The mean life of a radon 222 atom is 132 4 hours which is the half life of 3 825 days multiplied by 24 hours per day divided by the natural lo...

Страница 20: ...2 295 111 2 313 112 2 330 113 2 348 114 2 366 115 2 384 116 2 402 117 2 420 118 2 438 119 2 457 120 2 475 121 2 494 122 2 513 123 2 532 124 2 551 125 2 571 126 2 590 127 2 610 128 2 629 129 2 649 130...

Страница 21: ...to detail you may be able to get the variation down to under 5 When taking a sample it is important that the water being sampled has never been in contact with air When sampling from a body of water i...

Страница 22: ...5 2 8 Relative Humidity If the RAD7 is thoroughly dried out before use the relative humidity inside the instrument will stay below 10 for the entire 30 minutes of the measurement If not then the humi...

Страница 23: ...ervatively estimated to reflect typical field usage The most demanding and patient RAD H2O operator should be able to reduce background to less than 0 02 cpm rather than the 0 10 cpm given in the tabl...

Страница 24: ...ute count 51 20 2 5 19 20 120 minute count 36 14 1 8 14 14 2 sigma uncertainty at 100 pCi L in pCi L 20 minute count 53 20 24 20 60 minute count 31 12 1 5 14 12 120 minute count 22 8 5 1 1 10 8 5 DL C...

Страница 25: ...sible water in or on the instrument it can be put in an oven at 50 C for a few hours to dry out completely Additionally desiccated air can be passed through the air path until the air leaving the RAD7...

Страница 26: ...mplished using the included Bypass Assembly which allows some air pressure to bypass the aerator and flow directly from the RAD7 outlet to the drying tube The RAD H2O Bypass Assembly should be connect...

Страница 27: ...at DURRIDGE Company The precise factor for any setup depends also on the choice and length of tubing For the most reliable assessment users should perform their own experiments with their own setup Co...

Страница 28: ...or 250 protocol In fact the two could be made with the same sample First make a normal RAD H2O measurement then without changing the physical setup change the preset WAT protocol to SNIFF bypass the a...

Страница 29: ...ironmental Studies 55 66 2012 Burnett W C R N Peterson I R Santos and R W Hicks Use of automated radon measurements for rapid assessment of groundwater flow into Florida streams Journal of Hydrology 3...

Страница 30: ...Hess C T and S M Beasley Setting up a Laboratory for Radon in Water Measurements Chapter 13 in Cothern and Rebers 1990 Hunkeler D et al Can 222Rn be sued as a partitioning tracer to detect mineral oil...

Страница 31: ...Products Inc Shallow Tray Low Profile Air Strippers and VOC and Radon Removal from Water pamphlets NEEP 17 Technology Drive West Lebanon NH 03734 1992 Prichard H M and T F Gesell Rapid Measurements of...

Страница 32: ...ng Water Reducing Your Exposure to Radon 570 9 91 600 June 1991 U S EPA Office of Drinking Water Radionuclides in Drinking Water Factsheet 570 9 91 700 June 1991 Vitz E Toward a Standard Method for De...

Страница 33: ...mpany Inc All rights reserved DURRIDGE the DURRIDGE logo and the Works with the DURRIDGE logo are trademarks of DURRIDGE Company Inc registered in the U S Note DURRIDGE frequently updates its product...

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