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APPENDIX IV 93
will undergo some further modification, which has again been
decided upon by the Interministerial Committee and which will be
discussed in the next annual report.
The new version of the measurement programme takes into
account the principles set forth in ICRP publication No. 7, according
to which special attention should be paid in environmental monitoring
to the critical nuclides, whose emission constitutes the greatest
hazard for the critical population group via the critical pathway.
Accordingly, besides improvements (some of them introduced
earlier) with regard to the overall monitoring of alpha and beta
activity for the purpose of determining individual nuclides, general
gamma-spectrometric measurements with Ge(Li) detectors have been
included in the programme where appropriate. The most important
addition to the measurement programme is the monitoring of "31I,
which can be a critical nuclide for most of the emitters at KFA both
during normal operation and in the event of an incident. The individual
modifications of the measurement programme are indicated
below:
(a) Monitoring of air (Table XVI)
The electrostatic collection — for one hour on working days —
of air dust samples, which does not yield representative results,
and the parallel measurement of environmental radiation with an
ionization chamber were discontinued and the radiochemical
analysis of precipitation confined to the determination of the annual
values for 89 Sr and 90 Sr (because of the relatively short half-life
of 89Sr, the annual value for this nuclide is determined on the basis
of four quarterly samples). It was possible to discontinue the other
expensive radiochemical analyses thanks to the gamma-spectrometric
determination of the individual nuclides with a Ge(Li) detector and a
2048-channel analyser. Air-monitoring activities were extended to
include the measurement of the alpha activity of the precipitation in
the Outer monitoring ring.
(b) Monitoring of water (Table XVII)
The water monitoring programme was extended to include mud
from the main drain. The sampling of ground water and drinking
water at a number of gauge pipe locations, water works and industrial
sites was discontinued. The monitoring of drinking water was extended
to include the KFA waterworks;