Trials of dissemination from aircraft, and estimated theoretical inhaled dose of ZnCdS at the sampling point with maximum particle count
| Report | Date of trial | Approximate amount released (kg) | Location | Maximum particle count | Sampling rate (l/min) | Estimated inhaled dose (μg)* |
|---|---|---|---|---|---|---|
| Several additional programmes were approved, but details of these trials are unavailable. These include proposed aircraft dissemination trials with unspecified location (programme 23/60), at Cardington (programme 2/61, 24/62 and 10/63), Netheravon (programme 14/63) and over Norwich (programme 2/64). | ||||||
| *Assuming respiratory rate of 16.6 l/min1, 1.7×010 particles/g (FR 504; PN 185), and loss of 50% of fluorescence (Collins 1981) . Thus, for the trial on 18 August 1959, the inhaled dose at Dorchester is estimated as (4315 (particle count)×2 (loss of fluorescence)×16.6 (breathing rate))/(20 (sampling rate)×1.7×1010 (number of particles/g)) = 4.21×10-7 g=0.42 μg (0.13 μg Cd). | ||||||
| †Assumed flow rate. | ||||||
| ‡18 and 19 of PN 134 missing. | ||||||
| §Land based sampling (samples were also collected at sea). | ||||||
| ¶At height 2 m. | ||||||
| **Not given. | ||||||
| ††PFTR 610 missing, but details are reported elsewhere39. | ||||||
| FR=field report; PN=Porton note; PTP=Porton technical paper; PFTR=Porton field trial report. | ||||||
| FR 504 | 11 September 1956 | 12 | Porton | 351 | 17.5† | 0.039 |
| 17 September 1956 | 111 | North Sea | 93 | 17.5 | 0.010 | |
| FR 514 | 25 April 1957 | 138 | North Sea | 337 | 22 | 0.030 |
| FR 516 | 28 August 1957 | 5 | Cardington | 3403 | 20 | 0.332 |
| FR 515 | 13 November 1957 | 117 | North Sea | 112 | 10 | 0.022 |
| PTP 633 | 14 November 1957 | ** | Cardington | 99¶ | 20 | 0.010 |
| 15 November 1957 | ** | Cardington | 1070¶ | 20 | 0.104 | |
| PN 68 | 22 July 1958 | 98 | Irish Sea | 415 | 20 | 0.041 |
| PN 138 | 18/19 September 1958 | 116 | English Channel | 674 | 20.5 | 0.064 |
| PN 139 | 28 October 1958 | 120 | English Channel | 669 | 20.5 | 0.064 |
| PN 145 | 11 December 1958 | 83 | North Sea | 144 | 20.5 | 0.014 |
| PN 185 | 14 April 1959 | 123 | English Channel | 182 | 20.5 | 0.017 |
| PN 186 | 26 May 1959 | 139 | North Sea and NE England | 1591 | 21.5 | 0.145 |
| PN 187 | 7 July 1959 | 139 | English Channel & Cornwall | 123 | 20 | 0.012 |
| PN 188 | 18 August 1959 | 127 | English Channel | 4315 | 20 | 0.421 |
| PN 253 | 19 March 1958 | ** | Cardington | ** | ** | |
| 4 March 1959 | ** | Cardington | ** | ** | ||
| 7 May 1959 | ** | Cardington | ** | ** | ||
| 9 September 1960 | ** | Cardington | ** | ** | ||
| PN 134 | 29 May 1959 | 45 | Cardington | 96¶ | 20 | 0.009 |
| 3 June 1959 | 45 | Cardington | 44¶ | 20 | 0.004 | |
| 25 August 1959 | 45 | Cardington | 17¶ | 20 | 0.002 | |
| 15 September 1959 | 45 | Cardington | 129¶ | 20 | 0.013 | |
| 16 September 1959 | 45 | Cardington | 34¶ | 20 | 0.003 | |
| 17 September 1959 | 45 | Cardington | ‡ | 20 | ||
| 18 September 1959 | 45 | Cardington | ‡ | 20 | ||
| 22 September 1959 | 45 | Cardington | 8¶ | 20 | 0.001 | |
| 23 September 1959 (1st) | 45 | Cardington | 278¶ | 20 | 0.027 | |
| 23 September 1959 (2nd) | 45 | Cardington | 271¶ | 20 | 0.026 | |
| PN 183 | 21 April 1960 | 17.5 | Cardington | 209¶ | 20 | 0.020 |
| 25 May 1960 | 17.5 | Cardington | 143¶ | 20 | 0.014 | |
| 26 May 1960 (1st) | 17.5 | Cardington | 285¶ | 20 | 0.028 | |
| 26 May 1960 (2nd) | 17.5 | Cardington | 315¶ | 20 | 0.031 | |
| 26 May 1960 (3rd) | 17.5 | Cardington | 157¶ | 20 | 0.015 | |
| 17 June 1960 | 91 | Cardington | 387 | 20 | 0.038 | |
| 29 June 1960 | 91 | Cardington | 30 | 20 | 0.003 | |
| 30 June 1960 | 91 | Cardington | 87 | 20 | 0.008 | |
| 1 July 1960 | 91 | Cardington | 36 | 20 | 0.004 | |
| PTP 764 | 27 October 1960 | 74 | English Channel | 2§ | 21.3 | 0.000 |
| 28 October 1960 | 74 | English Channel | 91§ | 19.8 | 0.009 | |
| Programme 17/60/PFTR 610†† | ** | ** | Salisbury | ** | ** | |
| PFTR 610†† | 28 March 1963 | 68 | Norwich | 377 | 10 | 0.074 |