Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Biophysical modelling of the effects of inhaled radon progeny on the
  bronchial epithelium for the estimation of the relationships applied in the
  two stage clonal expansion model of carcinogenesis   There is a considerable debate between research groups applying the two stage
clonal expansion model for lung cancer risk estimation, whether radon exposure
affects initiation and transformation or promotion. The objective of the
present study is to quantify the effects of radon progeny on these stages with
biophysical models. For this purpose, numerical models of mutation induction
and clonal growth were applied in order to estimate how initiation,
transformation and promotion rates depend on tissue dose rate. It was found
that rates of initiation and transformation increase monotonically with dose
rate, while effective promotion rate decreases with time, but increases in a
supralinear fashion with dose rate. Despite the uncertainty of the results due
to the lack of experimental data, present study suggests that effects of radon
exposure on both mutational events and clonal growth are significant, and
should be considered in epidemiological analyses applying mathematical models
of carcinogenesis.

4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph